Abstract This work studies the firm-level relationship between different types of innovative activities and employment growth rates. Improving on previous investigations on the topic, it combines a detailed analysis of the effects of product and process innovation on average employment growth with a broader outlook on the whole conditional employment growth distribution. Results show that product innovation—especially in terms of good new to the entire market—has a positive effect on employment growth. This role is likely to be particularly relevant for both fast-growing and shrinking firms. Process innovation appears instead to have less clear-cut dynamics, consistently with existing evidence. Among different types of process innovation, the introduction of novel auxiliary processes appears to be more positively linked with employment growth. 1. Introduction What is the role of different types of innovation for firm’s employment growth? Is this role heterogeneous between growing and shrinking firms? This work aims at providing an answer to these questions with a novel perspective, focusing on the Spanish manufacturing sector. Improving on previous investigations on the topic, this essay combines a detailed analysis of the effects of product and process innovation on average employment growth with a broader outlook on the whole conditional employment growth distribution. Departing from conditional averages allows to focus on the role of innovation driving employment growth of fast-growing or shrinking firms, rather than substantially stable (average) ones, which is particularly important from a policy perspective. Firms do not carry out a single type of product or process innovation; however, this heterogeneity is rarely investigated comprehensively in the literature. This work further analyzes the role of different types of product and process innovation, focusing on goods vs. services, and on methods of production vs. logistics and auxiliary processes, and this allows providing additional interesting insights. The analysis is carried out using a panel of Spanish firms in the manufacturing sector from 2004 to 2012 (Panel Innovación Tecnológica). The results show that product innovation—especially in terms of goods new to the entire market—has a positive effect on employment growth. This role is likely to be particularly relevant for both fast-growing and shrinking firms. Process innovation appears instead to have less clear-cut dynamics, consistently with existing evidence. Among different types of process innovation, the introduction of novel auxiliary processes appears to be more positively linked with employment growth, while the role of product innovation is driven by the introduction of new goods. Robustly assessing the effects of technological innovation on employment growth is relevant for a number of reasons. Understanding whether technical change is beneficial or detrimental for employment, and whether this role is different for different types of firms, is currently at the center of the policy discussions. In fact, the debate concerning the effects of technological innovation on employment growth is long standing. The theoretical literature does not provide clear-cut evidence on innovation being ex ante labor saving or labor destroying nor unequivocally establishes the extent to which different compensation mechanisms and indirect effects influence employment growth. Micro-econometric evidence tends to support the existence of a positive relation between innovation and employment, especially when R&D or product innovation are adopted as proxies of innovative activity and more when high-technology sectors are the center of the analyses. Limited availability of longitudinal innovation databases has constrained the extent to which the relationship between innovation and employment growth has been so far investigated. Furthermore, despite the role of patenting activity and R&D expenditures proved to be different for fast-growing and shrinking firms, comprehensive analysis of the effects of different kinds of innovation over the whole employment growth distribution has been limited, so far. This study tackles these issues and combines a descriptive nonparametric analysis with a comprehensive econometric analysis based on different techniques. Namely, the analysis on conditional averages is carried out in a dynamic panel GMM framework, following Arellano and Bover (1995), that allows to control for unobserved heterogeneity, possible endogeneity of innovation variables and dynamic effects in the employment growth process. The analysis aimed at disentangling the role of technical change over the conditional employment growth distribution is instead carried out in a quantile regression framework, which appears particularly useful in informing the formulation of hypotheses to reconcile the ambiguous effects of process innovation that have been documented by the existing literature. This work is organized into five sections. The following section further motivates and contextualizes the study in the light of the theoretical and empirical debate; the third section describes the sample used and provides a descriptive analysis; the fourth section presents the econometric model and the results of the empirical exercises, as well as extensions and robustness checks; the final section concludes. 2. Literature background and motivation The debate on the effects of technical change on employment growth dates back to the Luddites, includes the Ricardian conceptualization of technological unemployment (Ricardo, 1817), the Keynesian predictions on “mankind solving the economic problem in the long run” via technological progress (Keynes, 1931), and culminates in the discussions on the widespread effects of automation and robotization on western societies (see for instance Graetz and Michaels, 2015). This section provides a theoretical introduction and a focus on the empirical contributions that examine the effect of innovation—in its different declinations—on employment growth at the firm level, further motivating this study. It builds upon the work by Calvino and Virgillito (2018), in which the interested reader can find additional details and discussion. The relationship between innovation and employment growth, i.e. the extent to which technological progress is labor saving, is a key issue in economics both from a theoretical and empirical perspective. The theoretical literature does not provide clear-cut evidence on innovation being ex ante labor saving or labor destroying nor unequivocally establishes the extent to which different compensation mechanisms and indirect effects are in place (see Spiezia and Vivarelli, 2002; Pianta, 2005; Vivarelli, 2014 for further details). The theoretical debate, in fact, opposes school of thoughts that argue in favor of the effectiveness of self-equilibrating compensation mechanisms, which automatically absorb the effects of innovation on employment leading to an asymptotic equilibrium of the economic system to scholars that frame innovation as a complex phenomenon, with manifold counteracting effects due to interaction of heterogeneous agents. One of the key issues to take into account when examining the effects of innovation on employment growth is the distinction between different kinds of innovative activities. In particular, as pointed out by Dosi (1984: 104), “product innovation of one sector are often process innovation for other sectors which are using them. The distinction nonetheless is theoretically fruitful.” Product innovation is in fact directly associated with a positive effect on employment, inducing employment growth via the increase of the demand for the new products. However, this direct positive effect is limited if the new products substantially replace the sales of old ones (cannibalization effect). Process innovation is instead directly associated with negative effects, via the increase in efficiency that, at output fixed, is linked to job destruction. A number of indirect effects, part of which are labeled by the literature as compensation mechanisms, act in opposite direction. Namely, the positive effect of product innovation is limited by the extent to which product and process innovation strategies are complementary. The negative effect of process innovation may be instead re-equilibrated via different channels (decreasing prices, increasing labor demand following declining wages in a competitive labor market, increasing investments or increasing income).1 The empirical validity of such compensation mechanisms is still debated. However, some studies provide empirical support to the mechanism via decrease in prices, which relates process innovation to an increase in firm-level demand due to the reduction in production costs and prices (Vivarelli, 1995; Simonetti et al., 2000; Harrison et al., 2014). Despite many theoretical (and empirical) studies emphasize the Schumpeterian distinction between product and process innovation, the building blocks of these two kinds of innovation are rarely discussed in depth. Reference definitions come from the Organisation for Economic Co-operation and Development (OECD) Oslo manual (OECD and Eurostat, 2005). Product innovation includes both new or significantly improved goods and services. Process innovation encompasses, instead, new or significantly improved methods of production, delivery methods, changes in techniques, and equipment or software, and can be apt to quality increase or cost decrease. Different building blocks of product and process innovation can have specific effects on employment dynamics. For instance, the introduction of a new delivery system could require more workers, despite being a process innovation. Furthermore, the role of software and information systems can be ambiguous (and is widely discussed in the literature that debates on skill-biased technical change, see for instance Autor et al., 2003). Empirical evidence on the effects of innovation on employment growth is wide. For the purpose of this work, let us focus on some of the most recent firm-level studies, and especially on the ones analyzing the role of different kinds of innovative activities. An important caveat that needs to be kept in mind (and will be further discussed in this work) is the relevance of the level of aggregation at which analyses are carried out. More specifically, it is not obvious to interpret a positive effect of innovation on employment growth at firm level as evidence of the fact that innovation induces a general increase in employment at industry (or society) level. As a matter of fact, market selection, business stealing and market expansion effects, firm entry and exit, and relocation of activities, may induce completely different dynamics at higher levels of aggregation (see Calvino and Virgillito, 2018 for further details). Micro-econometric evidence tends, to a certain extent, to support the existence of a positive relation between innovation and employment growth especially when R&D or product innovation are adopted as proxies of innovative activity and more when high-technology firms are the center of the analyses (see Peters, 2005; Hall et al., 2008, 2009; Hölzl, 2009; Coad and Rao, 2011; Evangelista and Vezzani, 2012 and Harrison et al., 2014 among the others). This relation appears to be pro-cyclical, with product innovators being generally more resilient to recessions (Dachs et al., 2017). Empirical estimates of the effects of process innovation on the conditional average of the employment growth distribution are instead ambiguous (see for instance Harrison et al., 2014 on four countries including Spain; Evangelista and Vezzani, 2012 and Dachs et al., 2017 on a wider number of countries; Greenan and Guellec, 2000 on France). A limited number of contributions analyze the relationship between product and process innovation and employment growth using panel data. Lachenmaier and Rottmann (2011) investigate the role of product and process innovation by using a panel data set stemming from the Ifo Innovation Survey and covering manufacturing firms in Germany for more than 20 years (1982–2002) by means of a dynamic GMM-SYS framework. In contrast with previous literature, Lachenmaier and Rottmann (2011) find that the effect of process innovation tends to be higher in magnitude with respect to the one of product innovation.2 In a similar vein, using a long Spanish panel between 1990 and 2008, Triguero et al. (2014) further investigate whether firms show heterogeneous responses in employment growth depending on the degree of persistence of their different innovative activities, comparing SMEs and larger firms. Similarly to Lachenmaier and Rottmann (2011), they support the existence of a positive link between persistent process innovation activities and employment, with the magnitude of such effect increasing with the time lag considered, especially for SMEs, while no significant effect is found for persistence in product innovation. These insights are challenged by Bianchini and Pellegrino (2017), who suggest instead—using a different methodology that combines GMM techniques with survival analysis—that persistence in product innovation significantly matters for both employment growth and for the sustainability of jobs creation over time, contrarily to persistence in process innovation. Finally, Peters et al. (2014) use German data from the Mannheim Innovation Panel between 1994 and 2012. They adapt the framework proposed by Harrison et al., 2014 accounting for individual heterogeneity in a fixed-effects framework, suggesting a positive role of product innovation and very limited displacement effects of process innovation. It has been clear, so far, that both theoretical and empirical insights suggest that different types of innovation may have different impacts on employment. Despite the role of patenting activity and R&D expenditures proved to be different for fast-growing and shrinking firms (see for instance Coad and Rao, 2011; Falk, 2012; Segarra and Teruel, 2014; Coad et al., 2016), comprehensive analysis of the effects of different kinds of innovation over the whole employment growth distribution has been limited, so far. In this respect, Herstad and Sandven (2015) link Norwegian CIS2008 data with business register, before and after the innovation survey, ordering into categorical classes firms with different growth rates.3 Their results suggest a certain degree of autocorrelation in growth rates, and a correlation between ex ante growth and innovative activity, which further strengthen employment growth when both product and process innovations are introduced. Furthermore, Herstad and Sandven (2015), challenging common empirical findings, suggest that process innovation is significantly associated with positive ex post employment growth, especially for firms in the top of the distribution. On the other hand, Zimmermann (2009) analyzes the relationship between product and process innovation and employment growth, focusing exclusively on small and medium enterprises in Germany. Zimmermann (2009) estimates a quantile regression model in the context of a dynamic labor demand equation, investigating the effect of product and process innovation (occurred between time t−2 and t−4) on the 2-year average employment growth rate distribution. The findings suggest that innovation (especially process innovation) has a positive effect of employment for both growing and shrinking SMEs in Germany.4 However, in this context, generalizing country-specific findings is not obvious. Hölzl (2009), for instance, suggests that innovation success and R&D intensity are crucially important for high-growth SMEs in countries closer to the technological frontier (despite a decrease in magnitude of such effects in the very top 5%), than in countries further away. Moreover, high-growth SMEs look more innovative than non-high-growth SMEs exclusively in economies which are not too far from the technological frontier.5 3. Data and descriptive analysis The analysis is carried out using the Spanish Technological Innovation Panel (Panel Innovación Tecnológica, henceforth PITEC) between 2004 and 2012. PITEC is the result of a joint effort by the Spanish National Statistical Institute (INE), the Spanish Foundation for Science and Technology (FECYT), and the Spanish Foundation for Technical Innovation (COTEC).6 The key characteristics that distinguish PITEC from the majority of Innovation Surveys (such as the CIS, collected by Eurostat) are its longitudinal nature and the presence of a considerable number of different innovation indicators. Indeed, since 20047 systematic data collection efforts allow to follow the same firms over time. PITEC data have been recently used to the study of innovative activity and growth in recent years (see among others Segarra and Teruel, 2014; Bianchini et al., 2016 or Coad et al., 2016). A summary of the variables used in this work is presented in the following subsections. Both innovative and non-innovative firms populate the sample, which combines representative subsamples of small firms (with less than 200 employees) and larger businesses (more details on representativeness can be found in the Appendix). 3.1 Sample and panel composition The sample period analyzed ranges between 2004 and 2012. The focus is limited to the manufacturing macro-sector.8 Due to changes in industry classification (from CNAE-93 to CNAE-09 between 2008 and 2009) a probabilistic industry converter has been implemented—to properly control for sector invariant effects—calculating weights based on observations for which both industry classifications are available. Details are provided in the working paper version of this analysis (Calvino, 2016). The analysis focuses on organic employment growth.9 The panel includes 6561 firms. For about 50% of the firms all time lags are observed. Most firms (almost 75%) are observed for six consecutive periods or more. A limited number of gaps are found in the panel (about 1.8% of the sample). Descriptive statistics are presented in Table A1.10 3.2 Variables of interest and descriptive evidence The main variables that we use to study the relationship between innovation and employment growth are presented hereafter. 3.2.1 Employment growth The response variable of our interest is firm-level employment growth ( Gi,t ). Let Ei,t be the employment of firm i at time t, and then employment growth is defined as: Gi,t= log(Ei,t)− log(Ei,t−1). (1) A kernel density estimate of the employment growth distribution is presented in Figure 1. The y axis is reported on a logarithmic scale. The fat tails of the distributions are consistent with corroborated empirical evidence (see for instance Bottazzi and Secchi, 2006). Its resemblance to a tent-shape in logarithmic scale might suggest that a Laplace processes can be a first-order approximation to describe the empirical densities. However, a significantly high concentration of “zeros” is evident. This is possibly linked to the discrete nature of employment which, when measured in head counts as in this case, is an integer number. Further investigation would be necessary to corroborate this feature of employment growth distributions. Figure 1. View largeDownload slide Employment growth distribution. Notes: The graph shows a kernel density estimate of the employment growth distribution. Kernel densities are computed using an Epanechnikov kernel. The y axis is in logarithmic scale. The distribution is reported between −1.4 and 1.4. Figure 1. View largeDownload slide Employment growth distribution. Notes: The graph shows a kernel density estimate of the employment growth distribution. Kernel densities are computed using an Epanechnikov kernel. The y axis is in logarithmic scale. The distribution is reported between −1.4 and 1.4. 3.2.2 Innovation variables The PITEC database allows to have an in-depth look at the specificities of product and process innovation activities. The main explanatory variables used to investigate the effects of product vs. process innovation are presented hereafter.11 3.2.2.1 Product innovation Dummy equals to 1 if the firm introduces new or significantly improved products and 0 otherwise. We focus on product innovations which are new to the entire market, as they are more likely to represent a genuine innovative step. We will refer to this variable as ProdInn. The product innovation variable can be split in the following components. Goods: Dummy variable identifying whether product innovation consists of a new or significantly improved good. Services: Dummy variable identifying whether product innovation consists of a new or significantly improved service. 3.2.2.2 Process innovation Dummy equals to 1 if the firm introduces new or significantly improved processes and 0 otherwise. We will refer to this variable as ProcInn. Different types of process innovation can be distinguished, as follows. Methods: dummy variable that identifies the case in which process innovation consists on new or significantly improved production methods. Logistics: Dummy variable that identifies the case in which process innovation consists of new or significantly improved logistics, delivery, or distribution systems. Auxiliary processes: Dummy variable that identifies the case in which process innovation consists of new or significantly improved auxiliary processes (such as maintenance, IT, purchasing, or accounting processes). Descriptive statistics and kernel density estimates of the distribution of firm-level employment growth by innovation status are presented in Table A4 and in Figure 2, respectively. Particularly when using the process innovation proxy, a concentration of non-innovative firms in the left tail of the support of the employment growth distribution is evident. This is consistent with previous findings presented by Bianchini et al. (2016) on the sales growth distributions of Spanish firms. A different set of innovation variables will be also used, extending the main results as detailed in Section 4.3, further separating innovative activities associated with product innovation alone, process innovation alone, or both product and process innovation. Figure 2. View largeDownload slide Employment growth distribution—innovators vs. non-innovators. (a) Product vs. non-product innovators, (b) Process vs. non-process innovators. Notes: The graphs show a kernel density estimate of the employment growth distribution for innovators (new-to-the market product innovation and process innovation) and non-innovators. Non-innovators are reported in a different color. Kernel densities are computed using an Epanechnikov kernel. The y axis is in logarithmic scale. The distribution is reported between −1.4 and 1.4. Figure 2. View largeDownload slide Employment growth distribution—innovators vs. non-innovators. (a) Product vs. non-product innovators, (b) Process vs. non-process innovators. Notes: The graphs show a kernel density estimate of the employment growth distribution for innovators (new-to-the market product innovation and process innovation) and non-innovators. Non-innovators are reported in a different color. Kernel densities are computed using an Epanechnikov kernel. The y axis is in logarithmic scale. The distribution is reported between −1.4 and 1.4. 3.2.3 Age Differently from other innovation surveys, PITEC allows to take into account the age dimension, which we include in the analysis.12 A histogram of the age distribution is presented in Figure 3. The exponential decay of the age distribution over most of its support suggests that a geometric law could be an acceptable first-order approximation to describe its empirical distribution.13 Figure 3. View largeDownload slide Age distribution. Notes: The graph shows the histogram of the age distribution in 2011 over 36 bins. Qualitatively similar patterns hold for other years in the sample. Figure 3. View largeDownload slide Age distribution. Notes: The graph shows the histogram of the age distribution in 2011 over 36 bins. Qualitatively similar patterns hold for other years in the sample. However, consistently with most recent empirical evidence (see for instance Coad, 2010; Barba Navaretti et al., 2014; Coad et al., 2016), deviations from the geometric fit are more evident for youngest and oldest groups of firms. As a matter of fact, it is possible to note that the modal age in the 2011 sample presented in the figure is about 20 year, suggesting a deviation from the geometric fit, which would predict the modal age to equal the youngest group of firms in the sample. 4. Econometric analysis Motivated by the theoretical discussion on the effects of innovation on employment growth—carried out in the previous sections—we propose a model that attempts to explain differences in employment growth ( Gi,t ) by disentangling the specificities associated with product ( ProdInni,t ) and process ( ProcInni,t ) innovation. In particular, as previously emphasized, taking into separate account these kinds of innovative activities is relevant from a theoretical perspective. As a matter of fact, they may be associated with employment growth in a very different way, depending on the extent to which direct effects and different compensation mechanisms work.14 Three main relevant controls are included in the baseline equation: (i) lagged employment growth; (ii) firm age; and (iii) affiliation to a business group. Motivated by the literature that investigates the extent to which growth rates are autocorrelated (see among the others Ijiri and Simon, 1967; Bottazzi and Secchi, 2003; Bottazzi et al., 2007), lagged employment growth allows to take into account dynamic effects in the employment growth process. Recent empirical evidence suggests that young firms disproportionately contribute to net employment growth (see Haltiwanger et al., 2013; Criscuolo et al., 2014) and motivates including business age as an important control variable. Since firm organizational and corporate structure, and in particular business group affiliation, are notably key drivers of business performance (see among the others Teece, 1996; Mahmood and Mitchell, 2004; Granovetter, 2005), we also include this variable in our model.15 Controls also include industry and time fixed effects. Industry dummies allow to account for average industry-wide characteristics that might affect employment growth, such as real hourly wage rates, industry-level gross value added (as a proxy for the demand situation in the industry), or sectoral concentration.16 Year dummies are always included to control for common macroeconomic shocks (also considering that the period under analysis includes different phases of the business cycle).17 The baseline model estimated is therefore: Gi,t=αGi,t−1+β1ProdInni,t+β2ProcInni,t+β3 log(agei,t)+β4groupi,t+μi+vi,t. (2) Recall that G indicates employment growth, as previously defined. To simplify the notation, in Equation 2 we do not report time and sector dummies, which are however always included in the estimates; μi is firm-specific intercepts that allow to take into account firm-specific time-invariant unobserved heterogeneity, which can lato sensu include managerial abilities (Bloom and Van Reenen, 2010) or organizational routines (see Nelson and Winter, 1982; Dosi, 1988 or Becker, 2004 for a comprehensive review), particularly important in a dynamic capability framework (Teece et al., 1997). The baseline model is first estimated by means of a dynamic difference-GMM method following Arellano and Bover (1995), which allows to control for unobserved heterogeneity, possible endogeneity of innovation variables and dynamic effects in the employment growth process. All the choices related to the econometric estimation of the model are detailed and motivated in the following subsection. Additional analysis is carried out in a quantile regression framework, aiming at disentangling the role of technical change over the conditional quantiles of the employment growth distribution. This is particularly relevant, especially for policy-makers interested in the effect of innovation on the employment of either fast-growing or shrinking firms, rather than substantially stable (average) ones. 4.1 Dynamic panel analysis Consider the baseline model presented in Equation 2. Estimation by means of ordinary least squares (OLS) or fixed-effects produces inconsistent estimates (Nickell, 1981).18 In particular, the estimate of the α coefficient associated with the lagged dependent variable is biased upward in the case of OLS, while downward biased in the within-group case (Arellano and Bond, 1991). Different estimators have been proposed to eliminate the dynamic panel bias. Arellano and Bond (1991) propose a transformation of the data that allows removing the dynamic panel bias above described. Namely, they suggest to implement a first-difference transformation. This transformation alone does not eliminate the dynamic panel bias, as ΔGi,t−1 (in particular its component Gi,t−1 ) is still correlated with Δvi,t (in particular its component vi,t−1 ). However, longer lags (further back levels of lags) are available as instruments, as orthogonal to the error term. An alternative transformation, which is the one used in this work, is proposed by Arellano and Bover (1995). They suggest to subtract the average of all future available observations. This is attractive because it does not magnify gaps in unbalanced panels, as the first-difference transformation proposed by Arellano and Bond (1991) does. Lagged observations remain valid instruments, as they do not enter in the transformation. The choice of a difference GMM method is further driven by the fact that, as suggested in the literature, firm growth rates do not seem to exhibit strikingly high persistence (see for instance Bottazzi et al., 2011), which would limit instruments validity in the GMM difference framework. Furthermore, the validity of additional assumptions required by system GMM (in particular, that changes in the instrumenting variables are not correlated with firm-specific fixed effects) seems at least questionable. We adopt a two-step estimation strategy that guarantees robustness to heteroskedasticity patterns.19 Reported two-step standard error follows the small-sample correction proposed by Windmeijer (2005). In the baseline specification the innovation variables are considered as predetermined. Building upon the discussion proposed by Lachenmaier and Rottmann (2011), innovation decisions in firms may often be based on long-term considerations because costly and related to organizational change; on the other hand, labor decisions may be taken according to more contingent necessities. In particular, if firms plan their innovative activity at least two periods before the employment decision (because employment growth incorporates employment decisions at time t and t−1), we can treat the innovation dummies as predetermined (assuming also that companies are not able to anticipate future shocks at the time of the innovation decisions). Validity of these assumptions is hard to establish a priori and will be discussed, in particular looking at the Hansen and Difference-in-Hansen test statistics. Furthermore, this assumption will be relaxed in one of the robustness specifications, which considers innovation as endogenous, reducing therefore the number of valid instruments. Other controls are specified as exogenous. As previously highlighted, estimates with and without industry dummies are proposed in the following. Estimation of the baseline specification of the model in Columns (1) and (2) of Table 1 suggests that there is evidence of a positive and significant effect of new-to-the market product innovation in driving employment growth. It particular, estimates suggest that new-to-the-market product innovators grow (in terms of employment) about 1.5% faster than firms that do not carry on such innovative activity, other covariates held fixed. This is consistent with a good number of studies that investigate such relation at the firm level (including Benavente and Lauterbach, 2008; Hall et al., 2009; Crespi and Tacsir, 2012; Evangelista and Vezzani, 2012 and Harrison et al., 2014). Table 1. Difference GMM estimates Dependent variable: Gi,t (1) (2) (3) (4) Gi,t−1 −0.052*** −0.051*** −0.053*** −0.049*** (0.019) (0.018) (0.018) (0.017) ProdInni,t 0.015** 0.016*** (0.006) (0.006) ProcInni,t 0.004 0.007 (0.010) (0.007) ProdInni,t (goods) 0.014** 0.018*** (0.007) (0.006) ProdInni,t (services) −0.000 −0.002 (0.007) (0.007) ProcInni,t (methods) −0.003 0.001 (0.007) (0.006) ProcInni,t (logistics) 0.007 0.007 (0.007) (0.007) ProcInni,t (auxiliary) 0.010* 0.010* (0.006) (0.005) log(agei,t) −0.056*** −0.056*** −0.056*** −0.056*** (0.021) (0.018) (0.021) (0.018) groupi,t −0.012 −0.013* −0.012 −0.013* (0.008) (0.007) (0.008) (0.007) Industry dummies Yes No Yes No Year dummies Yes Yes Yes Yes Observations 28,775 28,775 28,775 28,775 Hansen P-value 0.364 0.340 0.685 0.578 AR1 P-value 0 0 0 0 AR2 P-value 0.433 0.384 0.504 0.367 Number of instruments 57 30 81 54 Dependent variable: Gi,t (1) (2) (3) (4) Gi,t−1 −0.052*** −0.051*** −0.053*** −0.049*** (0.019) (0.018) (0.018) (0.017) ProdInni,t 0.015** 0.016*** (0.006) (0.006) ProcInni,t 0.004 0.007 (0.010) (0.007) ProdInni,t (goods) 0.014** 0.018*** (0.007) (0.006) ProdInni,t (services) −0.000 −0.002 (0.007) (0.007) ProcInni,t (methods) −0.003 0.001 (0.007) (0.006) ProcInni,t (logistics) 0.007 0.007 (0.007) (0.007) ProcInni,t (auxiliary) 0.010* 0.010* (0.006) (0.005) log(agei,t) −0.056*** −0.056*** −0.056*** −0.056*** (0.021) (0.018) (0.021) (0.018) groupi,t −0.012 −0.013* −0.012 −0.013* (0.008) (0.007) (0.008) (0.007) Industry dummies Yes No Yes No Year dummies Yes Yes Yes Yes Observations 28,775 28,775 28,775 28,775 Hansen P-value 0.364 0.340 0.685 0.578 AR1 P-value 0 0 0 0 AR2 P-value 0.433 0.384 0.504 0.367 Number of instruments 57 30 81 54 Notes: Robust two-step standard error in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table 1. Difference GMM estimates Dependent variable: Gi,t (1) (2) (3) (4) Gi,t−1 −0.052*** −0.051*** −0.053*** −0.049*** (0.019) (0.018) (0.018) (0.017) ProdInni,t 0.015** 0.016*** (0.006) (0.006) ProcInni,t 0.004 0.007 (0.010) (0.007) ProdInni,t (goods) 0.014** 0.018*** (0.007) (0.006) ProdInni,t (services) −0.000 −0.002 (0.007) (0.007) ProcInni,t (methods) −0.003 0.001 (0.007) (0.006) ProcInni,t (logistics) 0.007 0.007 (0.007) (0.007) ProcInni,t (auxiliary) 0.010* 0.010* (0.006) (0.005) log(agei,t) −0.056*** −0.056*** −0.056*** −0.056*** (0.021) (0.018) (0.021) (0.018) groupi,t −0.012 −0.013* −0.012 −0.013* (0.008) (0.007) (0.008) (0.007) Industry dummies Yes No Yes No Year dummies Yes Yes Yes Yes Observations 28,775 28,775 28,775 28,775 Hansen P-value 0.364 0.340 0.685 0.578 AR1 P-value 0 0 0 0 AR2 P-value 0.433 0.384 0.504 0.367 Number of instruments 57 30 81 54 Dependent variable: Gi,t (1) (2) (3) (4) Gi,t−1 −0.052*** −0.051*** −0.053*** −0.049*** (0.019) (0.018) (0.018) (0.017) ProdInni,t 0.015** 0.016*** (0.006) (0.006) ProcInni,t 0.004 0.007 (0.010) (0.007) ProdInni,t (goods) 0.014** 0.018*** (0.007) (0.006) ProdInni,t (services) −0.000 −0.002 (0.007) (0.007) ProcInni,t (methods) −0.003 0.001 (0.007) (0.006) ProcInni,t (logistics) 0.007 0.007 (0.007) (0.007) ProcInni,t (auxiliary) 0.010* 0.010* (0.006) (0.005) log(agei,t) −0.056*** −0.056*** −0.056*** −0.056*** (0.021) (0.018) (0.021) (0.018) groupi,t −0.012 −0.013* −0.012 −0.013* (0.008) (0.007) (0.008) (0.007) Industry dummies Yes No Yes No Year dummies Yes Yes Yes Yes Observations 28,775 28,775 28,775 28,775 Hansen P-value 0.364 0.340 0.685 0.578 AR1 P-value 0 0 0 0 AR2 P-value 0.433 0.384 0.504 0.367 Number of instruments 57 30 81 54 Notes: Robust two-step standard error in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Process innovation does not seem to have any significant relation with the conditional average of the employment growth distribution. Differently from what found by Lachenmaier and Rottmann (2011) and Triguero et al. (2014), this suggests that compensation mechanisms tend to act in opposite directions and on average result in a zero net effect. Furthermore, there is evidence of small but significant autocorrelation in growth rates. The coefficient on the lagged dependent variable highlights that firms that experienced positive employment growth do not repeat it in the subsequent period, but conversely the trend tends to change direction. Commenting on other controls, consistently with corroborated literature (see for instance Haltiwanger et al., 2013 or Criscuolo et al., 2014), young firms tend to exhibit faster employment growth than their older counterparts. Furthermore, affiliation to a business group does not seem to have any effect on changes in employment growth in the sample under scrutiny. A key assumption for the validity of the coefficients’ estimates proposed is the exogeneity of instruments. When the model is overidentified (as the current case), statistical tests for instrument exogeneity are available (J test of overidentifying restrictions). A standard specification check for the two-step GMM model estimated is the J-test statistic proposed by Hansen (1982). It is a modified version of the older Sargan (1958) test and is robust to heteroskedasticity. Focusing on the Hansen P-value, it is evident that it does not reject the null of joint instruments exogeneity. The Hansen test can be also used to check the exogeneity of different subsets of instruments via the Difference-in-Hansen test (C statistic). The intuition underlying this test statistic exploits estimation of the model with and without a particular set of instruments.20 In this case, we focus on two groups of instruments that refer to (i) the lagged dependent variable; and (ii) the innovation variables. Difference-in-Hansen P-values (0.138 and 0.2) do not allow to reject the null of instruments validity, and the Hansen P-value remains high when the two groups are separately excluded.21 The Hansen and Difference-in-Hansen test are weakened by instruments proliferation (see for instance Bowsher, 2002). The estimates proposed in this article use collapsed instrument sets to (at least partially) deal with this issue, as suggested by Roodman (2009b) and highlighted in the previous subsection. The instrument count is reported in Table 1. Arellano and Bond (1991) design a test to further check instrument validity. In particular, their test deals with potential autocorrelation of the idiosyncratic error term ( vi,t ), which would invalid some instruments. The underlying intuition is that if the idiosyncratic error is serially correlated, part of the instruments would be endogenous (correlated to the error term in differences), and only longer lags would be valid (where the length would depend on the order of autocorrelation found). The Arellano and Bond (1991) test is applied to differenced residuals.22 In other words, if vi,t are not serially correlated, differenced residuals would be serially correlated of order 1 by construction, but not of order 2. We report the P-value for the AR(1) test, which rejects lack of first-order serial correlation, and the P-value for the AR(2) test, which does not reject lack of second-order serial correlation and therefore does not invalidate (part of) the instruments used.23 To examine more in detail the role of different product and process innovations, we reestimate the model presented in Equation 2 splitting the innovation variables into their building components. In this framework, product innovation is split in two dummies, goods and services, and process innovation is split in methods of production, logistics, and auxiliary processes, as described in the previous section. This allows further focusing on the heterogeneity of innovative activities and their role for employment growth. This is particularly relevant, as firms do not carry out a single type of product or process innovation, as emphasized in the previous sections. At our knowledge, this exercise has not been previously carried out in this stream of literature. Results presented in Columns (3) and (4) of Table 1 illustrate that the positive and significant effect of product innovation is confirmed and mainly comes from the introduction of new goods, rather than services. This is particularly meaningful, also given that our study focuses on the manufacturing sector. Furthermore, if anything, auxiliary services appear to have the more labor-friendly role, even if the relevant coefficients are only significant at the 10% level. The dynamics of other control variables are qualitatively similar to those presented in the main specification. Also in this case, exogeneity and validity of instruments are confirmed by the reported Hansen, AR(1) and AR(2) test statistics, and by unreported Difference-in-Hansen tests. 4.2 Quantile regression analysis Previous analyses focused on the effect of product and process innovation—and their different declinations—on the conditional average of the employment growth distribution, taking into account individual unobserved heterogeneity. However, simplifications associated with the focus on a single moment of the conditional employment growth distribution can hide different effects of the explanatory variables at different points of such distribution. This is particularly relevant, especially for policy-makers interested in the effect of innovation on the employment of either growing or shrinking firms, rather than substantially stable ones. Quantile regression, first introduced by Koenker and Bassett (1978), has a number of advantages with respect to usual regression methods (see also Coad and Rao, 2008 for further discussion). First of all, it has been shown that the distribution of the dependent variable is strikingly non-Gaussian. Inference based on assumption of normality of the error terms may not be always appropriate in this case. Furthermore, quantile regression results are characteristically robust to outliers and are able to picture the effect of covariates on the entire conditional distribution of employment growth. However, quantile regression estimates proposed do not control for potential unobserved heterogeneity.24 Comparing previously presented GMM estimates with simple pooled OLS can be informative on the direction of the bias. As presented in the Appendix (see Table A5), the product innovation coefficient is estimated quite accurately by a simple OLS, while the process innovation one is overestimated. As expected, the lagged dependent variable coefficient is instead biased upward. These caveats shall be taken in mind when analyzing the following sets of robust correlations, which do not pretend to draw any causal claim. In this subsection the results of the estimation of Equation 2 by means of quantile regression are presented.25 The following figures graph the coefficients associated with innovation covariates over the whole conditional distribution of employment growth (from the 10th to the 90th percentiles). Graphs from the baseline specification are reported in Figure 4a (new-to-the-market product innovation dummy) and Figure 4b (process innovation dummy). Graphs from the second specification (splitting innovation variables) are reported in Figure 5a (the new-to-the-market goods dummy); in Figure 5b (new-to-the-market services dummy); in Figure 6a (new methods); Figure 6b (new logistics systems); Figure 6c (new auxiliary processes). Figure 4. View largeDownload slide Quantile regression coefficients—main innovation variables. (a) Product Innovation, (b) Process innovation. Notes: Quantile regression coefficients associated with new-to-the-market product innovation (on the left) and process innovation (on the right) from Equation 2. The shaded area represents a 95% confidence band, calculated according to Koenker and Bassett (1982). Figure 4. View largeDownload slide Quantile regression coefficients—main innovation variables. (a) Product Innovation, (b) Process innovation. Notes: Quantile regression coefficients associated with new-to-the-market product innovation (on the left) and process innovation (on the right) from Equation 2. The shaded area represents a 95% confidence band, calculated according to Koenker and Bassett (1982). Figure 5. View largeDownload slide Quantile regression coefficients—splitting product innovation. (a) Product Innovation – Goods, (b) Product Innovation – Services. Notes: Quantile regression coefficients associated with new-to-the-market product innovation—goods (on the left) and services (on the right) from Equation 2. The shaded area represents a 95% confidence band, calculated according to Koenker and Bassett (1982). Figure 5. View largeDownload slide Quantile regression coefficients—splitting product innovation. (a) Product Innovation – Goods, (b) Product Innovation – Services. Notes: Quantile regression coefficients associated with new-to-the-market product innovation—goods (on the left) and services (on the right) from Equation 2. The shaded area represents a 95% confidence band, calculated according to Koenker and Bassett (1982). Figure 6. View largeDownload slide Quantile regression coefficients—splitting process innovation. (a) Process Innovation – Methods, (b) Process Innovation – Logistics, (c) Process Innovation – Auxiliary Processes. Notes: Quantile regression coefficients associated with process innovation—methods (on the top left), logistics (on the top right), and auxiliary processes (on the bottom) from Equation 2. The shaded area represents a 95% confidence band, calculated according to Koenker and Bassett (1982). Figure 6. View largeDownload slide Quantile regression coefficients—splitting process innovation. (a) Process Innovation – Methods, (b) Process Innovation – Logistics, (c) Process Innovation – Auxiliary Processes. Notes: Quantile regression coefficients associated with process innovation—methods (on the top left), logistics (on the top right), and auxiliary processes (on the bottom) from Equation 2. The shaded area represents a 95% confidence band, calculated according to Koenker and Bassett (1982). Let us focus on the first specification presented in Figure 4 (and in panel (a) of Table A6), where only two innovation dummies are included. New-to-the-market product innovation appears positively and significantly associated with employment growth over the entire conditional employment growth distribution. The magnitude of the effect exhibits a U-shaped pattern, higher at the bottom of the conditional distribution and, to a lower extent, between the 60th and 85th percentile. Process innovation, instead, looks more positively associated with employment growth at the bottom of its conditional distribution. The magnitude of such effect is decreasing in the conditional quantiles. At the top of the distribution, in fact, process innovation does not seem to be a significant determinant of employment growth (looking at the confidence bands note that we cannot reject a coefficient with negative sign at the very top of the distribution). Separately looking at the different building blocks of product and process innovation (see also panel (b) of Table A6) allows disentangling different contributions to the otherwise net effect of innovation on employment growth, presented in the main specification. Focusing on goods and services new to the entire market, one can notice that the effect of goods is similar to the general pattern of product innovation, while the role of services is more evidently increasing in the conditional quantiles (despite generally not statistically significant). Furthermore, deconstructing the general role of process innovation by means of different dummies, one can notice that it is mainly driven by new methods, which are the main component of process innovation. Conversely, despite less frequent in the database, auxiliary processes confirm to have positive and significant coefficients across all the conditional employment growth distribution. This result is interesting in the light of the debate on the effects of digitalization (which is at the root of a good part of such activities) on employment growth and firm performance (see for instance Brynjolfsson and Hitt, 2000). The interpretation of the variation in magnitude of the coefficients associated with the introduction of new goods over the conditional employment growth distribution might not be completely intuitive. One could expect the role of innovation on employment growth for firms at the top of the conditional distribution to be higher in magnitude than elsewhere.26 Despite finding a positive association, our analysis does not highlight a disproportionately high magnitude when focusing on the top of the distribution (this is consistent with the analysis of Zimmermann, 2009 on German SMEs). One of the possible explanations is linked to the extent to which high-growth firms in the Spanish manufacturing sectors cannibalize their old products with new ones. An example could come from companies in the Spanish fashion cluster.27 Traditionally, this cluster has been characterized by high innovativeness but also almost complete replacement of old products with constantly new ones. This might suggest that the extent to which new products cannibalize older ones might likely vary over the conditional employment growth distribution. Furthermore, this pattern could also reflect country specificities and the peculiarity of the time period considered (which includes most of the recession years, in which higher demand associated with product innovation could have been constrained). The (net) effect of process innovation, especially of new methods of production, is decreasing in the quantiles of the conditional employment growth distribution, more significantly positive at the bottom of the distribution. This is at odds with the analysis on Norwegian data by Herstad and Sandven (2015) but consistent with the study on the sales distribution of Spanish manufacturing firm by Bianchini et al. (2016). One of the ways to possibly reconcile this dynamics could be to link it with the extent to which the price compensation mechanism works at different point of the conditional employment growth distribution. Recall that such mechanism suggests that the price decrease associated with process innovation boosts demand (over) compensating the reduction of workforce due to productivity improvements. The extent to which the price mechanism effectively works depends on the market power of firms and on the market structure. Young firms are expected to have lower market power and therefore to be less able to effectively reduce prices. For this category of businesses, the role of process innovation may tend to be closer to the theoretically predicted negative one, linked to higher efficiency rather than output increase. Those firms might well be the ones that, however, are mostly located at the top of the employment growth distribution. In our database, this tends to be supported also looking at the negative sign of the age coefficients above the median of the distribution (substantially negative toward the top), which suggests that especially younger firms are associated with higher employment growth (see also Criscuolo et al., 2014). Despite such interpretation is speculative and deserves further investigation, these dynamics would be hidden in a framework that does not look comprehensively at the effects of innovation on the whole employment growth distribution. Other covariates exhibit a similar pattern, both in the first and second specification. Age has a positive role in the bottom of the conditional growth distribution (suggesting lower degrees of adjustment of employment for older and larger highly shrinking firms). Its coefficient turns negative in the rest of the distribution suggesting, as previously mentioned, violation of the Gibrat’s law for younger firms, which tend to grow faster. Business group affiliation has a positive correlation with employment growth in the bottom of the distribution and a negative effect on the top. This suggests a dual role of business group affiliation, providing institutional infrastructure to shrinking firms but possibly hindering the proliferation of radical innovations in faster-growing firms. The magnitude of the lagged dependent variable coefficient remains overall small, further highlighting a limited degree of autocorrelation of employment growth rates. Goodness of fit of the regressions (calculated via pseudo R-squared) is low but comparable with other studies in the literature, and not particularly meaningful in a quantile regression setting. 4.3 Extensions and robustness A number of additional exercises have been carried out to extend and test the robustness of the above presented findings. They include (i) assessing the complementarities of innovation strategies; (ii) specifying the innovation variables as endogenous in the dynamic panel setting; and (iii) using lagged innovation variables to deal with simultaneity in quantile regression. Additional robustness tests are reported in Calvino (2016) and confirm that results are in line with the ones previously discussed when computing employment growth with the measure proposed by Davis and Haltiwanger (1999), when using a different turnover-based measure of product innovation, and when specifying the group variable as predetermined.28 4.3.1 Complementarity of innovation strategies As an important extension to the previous findings, in this subsection we focus on the complementarity of innovation strategies. Additional analysis is carried out here, estimating Equation 2 with a different set of innovation dummies, to take into first account the complementarities existing between product and process innovation strategies. Indeed, in Tables A7 and A8, instead of the ProdInn and ProcInn dummies, we use three different variables, which are defined as follows.29 ProdInn only: Dummy equals to 1 if the firm introduces new or significantly improved products and does not introduce any new or significantly improved process and 0 otherwise; ProcInn only: Dummy equals to 1 if the firm introduces new or significantly improved processes and does not introduce any new or significantly improved product and 0 otherwise; ProdInn and ProcInn: Dummy equals to 1 if the firm introduces both new or significantly improved products and processes and 0 otherwise. This classification of innovative activities allows to further separate specificities associated with product and process innovation alone when examining their correlation with employment growth. Table A7 presents the estimates on the conditional average of the employment growth distribution. The results confirm the positive effect of product innovation. The coefficient of ProdInn only is in fact positive and significant, with magnitude approximately two times higher than the coefficient presented in Table 1. ProcInn only remains instead not significant at 5% level. Coefficients of combined product and process innovation are positive and significant only in one of the two specifications. Other variables remain stable. Qualitative patterns of estimates presented in Table A8 corroborate the main findings, with a U-shaped effect of product innovation only, and positive effect of process innovation only especially at the bottom of the conditional growth distribution. 4.3.2 GMM: endogenous innovation variables To further test the robustness of our results, we estimate the main GMM model (as presented in Table 1 and specifying group as predetermined) specifying all innovation variables as endogenous. Estimates are reported in Table A9 for reference. The sign of the coefficients tends to be generally stable, despite in some cases they are estimated less precisely. Since in the models that treat innovation variables as endogenous the set of moment conditions is a strict subset of the moment conditions in the models where innovation variables are predetermined, we can use Difference-in-Hansen tests to assess the validity of the additional instruments in the models with predetermined innovation. These tests show that the models treating innovations as predetermined are not rejected.30 This further corroborates our choice to treat innovation variables as predetermined. 4.3.3 Quantile regression: lagged innovation variables As previously mentioned, the quantile regression setting does not allow to take into proper account endogeneity issues. However, we have tried a number of different specifications that corroborate the results presented in the analysis. In addition to the previously discussed robustness, Table A10 shows the coefficient estimates resulting from replacing innovation variables with their first lag, to partially deal with simultaneity issues. The results presented in panel (a) of Table A10 are substantially in line with those presented in Table A6. When splitting the innovation dummies in their building blocks in panel (b) of Table A10, estimates confirm the positive role of new goods across the whole distribution and of new methods at the bottom of the conditional distribution. Few differences are also evident. The change of sign in the methods coefficients at the top of the distribution is now statistically significant, confirming that the effect of this type of innovation decreases in the conditional quantiles. The positive role of auxiliary processes remains statistically significant only at the bottom of the conditional distribution. 5. Some concluding remarks This work has studied the role of different types of product and process innovation for firm employment growth, focusing in detail on whether this role appears heterogeneous between growing and shrinking firms. Improving on previous investigations on the topic, this essay has combined a detailed analysis of the effects of different types of product and process innovation on average employment growth with a broader outlook on the whole conditional employment growth distribution. Departing from conditional averages has allowed to focus on the role of innovation driving employment growth of fast-growing or shrinking firms, rather than substantially stable (average) ones, which is particularly important from a policy perspective. This work has further analyzed the role of different types of product and process innovation, focusing on goods vs. services, and on methods of production vs. logistics and auxiliary processes, providing additional interesting and novel insights. The analysis has been carried out using a panel of Spanish firms in the manufacturing sector from 2004 to 2012 (Panel Innovación Tecnológica). It has combined descriptive nonparametric approach with different econometric techniques. Namely, a dynamic panel GMM framework—that has allowed to control for unobserved heterogeneity, possible endogeneity of innovation variables and dynamic effects in the employment growth process—has been combined with a quantile regression analysis, aimed at disentangling the role of technical change over the conditional employment growth distribution. The results have shown that product innovation—especially goods, when new to the entire market—has a positive effect influencing employment growth. This role is likely to be particularly relevant for both fast-growing and shrinking firms. Process innovation appears instead to have less clear-cut effects, which are likely to result from different compensation mechanisms acting in opposite directions, consistently with existing evidence. Among different types of process innovation, the introduction of novel auxiliary processes appears to be more positively linked with employment growth. The dynamics of product innovation appear guided by the introduction of new goods, and this is particularly meaningful given the focus on the manufacturing sector. Results have been interpreted in the light of the specificities of the Spanish context, and of the possible role of cannibalization and compensation mechanisms. In this framework, quantile regression has been particularly useful in guiding the formulation of hypotheses to reconcile the ambiguous effects of process innovation that have been documented by the existing literature. An extensive discussion about the challenges, limitations and future research horizons related to this work are presented in Calvino (2016).31 Let us highlight again here that the analysis is carried out at the firm level on Spanish data. No external validity is claimed,32 and no direct conclusion on the effect of innovation on employment growth at more aggregate level would be appropriate.33 As a final note of caution, the reader should remind that CIS-like databases (including PITEC) suffer from a number of limitations associated with self-reporting, measurement errors, representativeness of the sample (that has been discussed in the Appendix), and anonymization challenges. However, we believe they are still able to offer a good (and unique) first degree of approximation concerning firm-level innovation activities and dynamics (see Mairesse and Mohnen, 2010 for further discussion). Footnotes 1 See Calvino and Virgillito (2018) or Vivarelli (2014) for in-depth discussions about these mechanisms. 2 The same authors provide similar findings in a previous study on the same data, exploiting static panel methods (see Lachenmaier and Rottmann, 2007). 3 They investigate the relationship between employment growth prior to innovative activity, innovation output, and growth after the innovation event. On the side of their main results by means of multivariate probit and ordered logit, they briefly discuss quantile regression as an alternative estimation strategy which provides consistent results to those presented in the core of their work. 4 With stronger effects on high-growth SMEs mostly in the case of process innovation. 5 Related analyses come also from the strand of empirical literature that studies the effect of innovation on growth using different innovation proxies, or which studies the effect product and process innovation on sales growth. Coad et al. (2016) focuses, for instance, on the impacts of R&D (and not of innovation output) on the sales, employment, and productivity growth of Spanish firms, while Bianchini et al. (2016) take instead a multidimensional approach to the analysis of the growth process of Spanish firms in terms of sales. 6 We use the anonymized version of the database, which has been widely used in the literature. Details on the anonymization procedure by individual ranking applied to quantitative variables (including employment) in PITEC are presented by López (2011), who shows empirically that it produces reliable results (see also Schmid and Schneeweiss, 2009 for further theoretical discussion). 7 Note that data collection effort starts the year before. In 2003, however, firms with less than 200 employees are significantly underrepresented. This year is therefore excluded from the analysis, similarly to other studies based on PITEC data. 8 CNAE-1993 industry codes from 15 to 37 and CNAE-2009 industry codes from 10 to 33. 9 In the survey a variable records unusual patterns in employment due to, for instance, mergers, acquisitions, or liquidations (Indicador de incidencia en el empleo). Only firms without contingencies have been analyzed. They correspond to about 99.4% of the sample. 10 Note that 568 firms that appeared for 1 year only have been dropped. The number of observation used for estimation reduces due to the inclusion of the lagged dependent variables and due to some missing in the age variable. 11 As in most innovation surveys, innovation variables refer to innovative activities carried out by the firm between time t−2 and t. 12 Information is available from 2009. Birth year is then retroactively attributed to continuing firms observed before 2009. A cleaning procedure is then applied, correcting implausible values. Data availability and cleaning result in 708 firms having missing age. See Calvino (2016) for further details. 13 Recent literature characterizes the age distribution as exponential, while we prefer to refer to the discrete nature of the age variable. 14 This approach does not aim at modeling explicitly the different channels that affect the relationship between different types of innovation and employment. A structural approach has been proposed by Harrison et al. (2014). 15 Business group affiliation exhibits a certain degree of variation within firm over time and is not entirely absorbed by the individual fixed effect. 16 Note however that in a dynamic panel perspective those dummies identify effects associated with changes in the industry, while industry average characteristics are already taken into account by the differencing transformation. In the panel specifications therefore results without industry dummies are also proposed. 17 This model is consistent with and equivalent to a traditional dynamic employment equation, augmented with innovation variables and a number of controls (as previously described), including lagged employment growth. Our focus is, however, particularly on the employment growth process—and its distribution—rather than on employment levels; therefore, we primarily refer to the tradition that proposes stochastic models of firm growth. 18 Naive pooled OLS estimation yields inconsistent estimates, as Gi,t−1 is correlated with the firm-specific effect μi, that would be included in a composite error term ϵi,t . Furthermore, inconsistency driven by omitted variable bias also may also occur in presence of unobserved firm-specific heterogeneity (such as, in this case, sticky organizational routines or managerial abilities). Fixed-effects estimation of the model (by means of the within-group or the LSDV estimators) does not eliminate the dynamic panel bias. In particular, applying the within-group transformation, the lagged dependent variable G*i,t−1 becomes Gi,t−1−1T−1∑t=2TGi,t , while the idiosyncratic shock v*i,t becomes vi,t−1T−1∑t=2Tvi,t . Fixed-effects estimation therefore produces inconsistent estimates because G*i,t−1 (in particular its Gi,t−1 component) correlates with v*i,t (in particular the 1T−1vi,t−1 term). Furthermore, 1T−1Gi,t−1 in G*i,t−1 and vi,t in v*i,t are simultaneously determined (see for instance Roodman, 2009a, see also Calvino, 2016 for further discussion). 19 Choice of the covariance matrix of the idiosyncratic errors H for the first-step estimation follows Roodman (2009a). 20 An unrestricted model with smaller set of instruments and a restricted one including the instruments for which endogeneity is suspected are compared. 21 Validity of goodness of the other moments conditions deriving from controls specified as exogenous is also confirmed by looking at other Difference-in-Hansen test statistics. 22 This occurs even if the estimation is carried out in orthogonal deviations. The test assumes that no regressor is post-determined (see Roodman, 2009b for further details). 23 Weak instrument problems and issues related to instrument strength in the context of dynamic panel GMM models are topics of current discussion (see Bazzi and Clemens, 2013). Stock and Yogo’s (2005) critical values for first-stage F-test (or its multivariate analogue, the Cragg-Donald Wald statistic) are rarely examined in the literature related to this study and—at the best of our knowledge—not implemented as output or options of standard econometrics packages for estimating dynamic panel models, such as xtabond2 (Roodman, 2009a). 24 This means that, referring to Equation 2, we do not separate μi from vi,t . Despite a growing literature on fixed effects quantile regression is growing, at our knowledge there is still little consensus on the topic especially in presence of models—like ours—that include a lagged dependent variable. A simple approach to quantile regression for panel data has been proposed by Canay (2011), but the limited length of the panel at our disposal (small t) prevents us from consistently applying it. 25 Graphs that describe the effect of the innovation covariates on the whole conditional distribution of the response variable are reported in the main body, while estimates at five points of the conditional distribution of the dependent variable (namely, the 15th, 30th, 50th, 70th, and 85th percentiles) are reported in the Appendix (Table A6). Conditional quantiles are estimated separately. Robust and clustered standard errors are reported in parentheses in the tables, following Parente and Santos Silva (2016). 26 See for instance Coad and Rao (2011) using a different innovation proxy on high-tech sectors in the United States. 27 Where a large number of brands and networks of suppliers are involved. 28 Further unreported robustness have also excluded potential outliers, included lagged employment as an additional control, included further lags of innovation variables (up to the second), and restricted the number of lags used as valid instruments in the main GMM model, without affecting the main conclusions. 29 We keep referring to product innovations new to the entire market, as in the rest of the article. 30 Unreported tests on the model that split innovation variables in their building blocks provide analogous insights. The P-values of the tests are always larger than 0.34. 31 These include further work on persistence, on sectoral specificities (see Triguero et al., 2014 and Bianchini and Pellegrino, 2017), on the role of non-technological innovation, on the role of the sales growth process and implications for productivity (see Mohnen and Hall, 2013 for a recent survey), on the composition of employment (see for instance Giuliodori and Stucchi, 2012 for an analysis on Spanish data), on the role of firm entry and exit (see Harrison et al., 2014 for further discussion), or on the persistence of jobs created (Ciriaci et al., 2016 provide indirect evidence on this issue using the same database). 32 Results are therefore limited to the specific time period under consideration in the Spanish manufacturing sector, as represented by the database used. In this respect, both Harrison et al. (2014) and Hölzl (2009) suggest that the extent to which results based on Spanish data are generalizable to other countries (such as France, Germany, or the UK for instance) is somehow limited. Further analysis should therefore corroborate the estimates using different databases in other countries. 33 As a matter of fact, selection, business stealing and market expansion effects, firm entry and exit, and relocation of activities, may induce completely different dynamics at higher levels of aggregation. Firm-level studies should therefore be adequately complemented by sectoral and macro-analyses. However, a credible comparison between micro and aggregate data requires highly representative database, such as Business Register records matched with innovation data. 34 The sources of comparison are the official statistics produced by Eurostat based on CIS data (http://ec.europa.eu/eurostat/web/science-technology-innovation/data/database, accessed in August 2015). 35 They are based on 49,368 observations. Acknowledgments The author is indebted with Angelo Secchi who provided many useful comments and suggestions on different drafts of this work. The author would also like to thank two anonymous referees, Stefano Bianchini, Giulio Bottazzi, Alex Coad, Chiara Criscuolo, Timothy DeStefano, Giovanni Dosi, François Fontaine, Maria Garcìa Vega, Georg Licht, Laura Magazzini, David Margolis, Orietta Marsili, Carlo Menon, Pierre Mohnen, Daniele Moschella, Alessandro Nuvolari, Bettina Peters, Federico Tamagni, Andrea Vezzulli, Maria Enrica Virgillito, Marco Vivarelli, participants in the Applied Microeconomics Seminar at Paris School of Economics, the 2016 International Schumpeter Society, and the SPRU 50th Anniversary Conference for their valuable insights. This article was prepared during author’s PhD at Scuola Superiore Sant’Anna and Paris School of Economics—Université Paris 1. Support by the European Union Horizon 2020 research and innovation program under grant agreement number 649186—ISIGrowth is gratefully acknowledged. Views expressed in this article are those of the author, and do not necessarily reflect the official views of any institution with which the author is affiliated. The usual disclaimer applies. References Arellano M. , Bond S. ( 1991 ), ‘ Some tests of specification for panel data: Monte Carlo evidence and an application to employment equations ,’ The Review of Economic Studies , 58 ( 2 ), 277 – 297 . Google Scholar Crossref Search ADS Arellano M. , Bover O. ( 1995 ), ‘ Another look at the instrumental variable estimation of error-components models ,’ Journal of Econometrics , 68 ( 1 ), 29 – 51 . Google Scholar Crossref Search ADS Autor D. , Levy F. , Murnane R. ( 2003 ), ‘ The skill content of recent technological change: an empirical exploration ,’ The Quarterly Journal of Economics , 118 ( 4 ), 1279 – 1333 . Google Scholar Crossref Search ADS Barba Navaretti G. , Castellani D. , Pieri F. ( 2014 ), ‘ Age and firm growth: evidence from three European countries ,’ Small Business Economics , 43 ( 4 ), 823 – 837 . Google Scholar Crossref Search ADS Bazzi S. , Clemens M. A. ( 2013 ), ‘ Blunt instruments: avoiding common pitfalls in identifying the causes of economic growth ,’ American Economic Journal: Macroeconomics , 5 ( 2 ), 152 – 186 . Google Scholar Crossref Search ADS Becker M. C. ( 2004 ), ‘ Organizational routines: a review of the literature ,’ Industrial and Corporate Change , 13 ( 4 ), 643 – 678 . Google Scholar Crossref Search ADS Benavente J. M. , Lauterbach R. ( 2008 ), ‘ Technological innovation and employment: complements or substitutes? ,’ The European Journal of Development Research , 20 ( 2 ), 318 – 329 . Google Scholar Crossref Search ADS Bianchini S. , Pellegrino G. ( 2017 ), ‘Innovation persistence and employment dynamics,’ IEB Working Paper 2017/03, Institut d’Economia de Barcelona. Bianchini S. , Pellegrino G. , Tamagni F. ( 2016 ), ‘Innovation strategies and firm growth,’ LEM Working Paper Series 2016/03, Scuola Superiore Sant’Anna. Bloom N. , Van Reenen J. ( 2010 ), ‘ Why do management practices differ across firms and countries? ,’ The Journal of Economic Perspectives , 24 ( 1 ), 203 – 224 . Google Scholar Crossref Search ADS Bottazzi G. , Cefis E. , Dosi G. , Secchi A. ( 2007 ), ‘ Invariances and diversities in the patterns of industrial evolution: some evidence from Italian manufacturing industries ,’ Small Business Economics , 29 ( 1–2 ), 137 – 159 . Google Scholar Crossref Search ADS Bottazzi G. , Coad A. , Jacoby N. , Secchi A. ( 2011 ), ‘ Corporate growth and industrial dynamics: evidence from French manufacturing ,’ Applied Economics , 43 ( 1 ), 103 – 116 . Google Scholar Crossref Search ADS Bottazzi G. , Secchi A. ( 2003 ), ‘ Common properties and sectoral specificities in the dynamics of US manufacturing companies ,’ Review of Industrial Organization , 23 ( 3/4 ), 217 – 232 . Google Scholar Crossref Search ADS Bottazzi G. , Secchi A. ( 2006 ), ‘ Explaining the distribution of firm growth rates ,’ The RAND Journal of Economics , 37 , 235 – 256 . Google Scholar Crossref Search ADS Bowsher C. G. ( 2002 ), ‘ On testing overidentifying restrictions in dynamic panel data models ,’ Economics Letters , 77 ( 2 ), 211 – 220 . Google Scholar Crossref Search ADS Brynjolfsson E. , Hitt L. M. ( 2000 ), ‘ Beyond computation: information technology, organizational transformation and business performance ,’ The Journal of Economic Perspectives , 14 ( 4 ), 23 – 48 . Google Scholar Crossref Search ADS Calvino F. ( 2016 ), ‘Technological innovation and the distribution of employment growth: a firm-level analysis,’ LEM Working Paper 2016/37, Scuola Superiore Sant’Anna, Pisa. Calvino F. , Virgillito M. E. ( 2018 ), ‘ The innovation-employment nexus: a critical survey of theory and empirics ,’ Journal of Economic Surveys , 32 ( 1 ), 83 – 117 . Google Scholar Crossref Search ADS Canay I. A. ( 2011 ), ‘ A simple approach to quantile regression for panel data ,’ The Econometrics Journal , 14 ( 3 ), 368 – 386 . Google Scholar Crossref Search ADS Ciriaci D. , Moncada-Paternò-Castello P. , Voigt P. ( 2016 ), ‘ Innovation and job creation: a sustainable relation? ,’ Eurasian Business Review , 6 ( 2 ), 189 – 213 . Google Scholar Crossref Search ADS Coad A. ( 2010 ), ‘ The exponential age distribution and the Pareto firm size distribution ,’ Journal of Industry, Competition and Trade , 10 ( 3–4 ), 389 – 395 . Google Scholar Crossref Search ADS Coad A. , Rao R. ( 2008 ), ‘ Innovation and firm growth in high-tech sectors: a quantile regression approach ,’ Research Policy , 37 ( 4 ), 633 – 648 . Google Scholar Crossref Search ADS Coad A. , Rao R. ( 2011 ), ‘ The firm-level employment effects of innovations in high-tech US manufacturing industries ,’ Journal of Evolutionary Economics , 21 , 255 – 283 . Google Scholar Crossref Search ADS Coad A. , Segarra A. , Teruel M. ( 2016 ), ‘ Innovation and firm growth: does firm age play a role? ,’ Research Policy , 45 ( 2 ), 387 – 400 . Google Scholar Crossref Search ADS Crespi G. , Tacsir E. ( 2012 ),.‘Effects of innovation on employment in Latin America,’ IDB Technical Note No. 496, Inter-American Development Bank. Criscuolo C. , Gal P. N. , Menon C. ( 2014 ), ‘The dynamics of employment growth,’ OECD Science, Technology and Industry Policy Papers No. 14, OECD Publishing, Paris. Dachs B. , Hud M. , Köhler C. , Peters B. ( 2017 ), ‘Employment effects of innovations over the business cycle: firm-level evidence from European countries,’ SWPS 2017-03. https://ssrn.com/abstract=2912140 or http://dx.doi.org/10.2139/ssrn.2912140. Davis S. J. , Haltiwanger J. ( 1999 ), ‘Gross job flows,’ in Card D. , Ashenfelter O. (eds), Handbook of Labor Economics , vol. 3 . North-Holland : Amsterdam , pp. 2711 – 2805 . Dosi G. ( 1984 ), ‘Technology and conditions of macroeconomic development,’ in Freeman C. (ed.), Design, Innovation and Long Cycles in Economic Development . Design Research Publications : London , pp. 99 – 125 . Dosi G. ( 1988 ), ‘ Sources, procedures, and microeconomic effects of innovation ,’ Journal of Economic Literature , 26 , 1120 – 1171 . Evangelista R. , Vezzani A. ( 2012 ), ‘ The impact of technological and organizational innovations on employment in European firms ,’ Industrial and Corporate Change , 21 ( 4 ), 871 – 899 . Google Scholar Crossref Search ADS Falk M. ( 2012 ), ‘ Quantile estimates of the impact of R&D intensity on firm performance ,’ Small Business Economics , 39 , 19 – 37 . Google Scholar Crossref Search ADS Giuliodori D. , Stucchi R. ( 2012 ), ‘ Innovation and job creation in a dual labor market: evidence from Spain ,’ Economics of Innovation and New Technology , 21 ( 8 ), 801 – 813 . Google Scholar Crossref Search ADS Graetz G. , Michaels G. ( 2015 ), ‘Robots at Work,’ CEP Discussion Paper No.1335, Centre for Economic Performance. Granovetter M. ( 2005 ), Business Groups and Social Organization . Princeton University Press , chap. 19, 429 . Greenan N. , Guellec D. ( 2000 ), ‘ Technological innovation and employment reallocation ,’ Labour , 14 ( 4 ), 547 – 590 . Google Scholar Crossref Search ADS Hall B. H. , Lotti F. , Mairesse J. ( 2008 ), ‘ Employment, innovation, and productivity: evidence from Italian microdata ,’ Industrial and Corporate Change , 17 , 813 – 839 . Google Scholar Crossref Search ADS Hall B. H. , Lotti F. , Mairesse J. ( 2009 ), ‘ Innovation and productivity in SMEs: empirical evidence for Italy ,’ Small Business Economics , 33 , 13 – 33 . Google Scholar Crossref Search ADS Haltiwanger J. , Jarmin R. S. , Miranda J. ( 2013 ), ‘ Who creates jobs? Small versus large versus young ,’ Review of Economics and Statistics , 95 ( 2 ), 347 – 361 . Google Scholar Crossref Search ADS Hansen L. P. ( 1982 ), ‘ Large sample properties of generalized method of moments estimators ,’ Econometrica: Journal of the Econometric Society , 50 ( 4 ), 1029 – 1054 . Google Scholar Crossref Search ADS Harrison R. , Jaumandreu J. , Mairesse J. , Peters B. ( 2014 ), ‘ Does innovation stimulate employment? A firm-level analysis using comparable micro-data from four European countries ,’ International Journal of Industrial Organization , 35 , 29 – 43 . Google Scholar Crossref Search ADS Herstad S. J. , Sandven T. ( 2015 ), ‘Innovation and corporate employment growth revisited,’ Papers in Innovation Studies No. 2015/3, Lund University, CIRCLE-Center for Innovation, Research and Competences in the Learning Economy. Hölzl W. ( 2009 ), ‘ Is the R&D behaviour of fast-growing SMEs different? Evidence from CIS III data for 16 countries ,’ Small Business Economics , 33 , 59 – 75 . Google Scholar Crossref Search ADS Ijiri Y. , Simon H. A. ( 1967 ), ‘ A model of business firm growth ,’ Econometrica: Journal of the Econometric Society , 35 ( 2 ), 348 – 355 . Google Scholar Crossref Search ADS Keynes J. M. ( 1931 ), ‘Economic possibilities for our grandchildren,’ in Essays in Persuasion . Macmillan & Co .: London , pp. 358 – 373 . Koenker R. , Bassett G. Jr . ( 1978 ), ‘ Regression quantiles ,’ Econometrica: Journal of the Econometric Society , 46 ( 1 ), 33 – 50 . Google Scholar Crossref Search ADS Koenker R. , Bassett G. Jr. ( 1982 ), ‘ Robust tests for heteroscedasticity based on regression quantiles ,’ Econometrica: Journal of the Econometric Society , 50 , 43 – 61 . Google Scholar Crossref Search ADS Lachenmaier S. , Rottmann H. ( 2007 ), ‘ Employment effects of innovation at the firm level ,’ Jahrbücher Für Nationalökonomie Und Statistik , 227 , 254 – 272 . Google Scholar Crossref Search ADS Lachenmaier S. , Rottmann H. ( 2011 ), ‘ Effects of innovation on employment: a dynamic panel analysis ,’ International Journal of Industrial Organization , 29 , 210 – 220 . Google Scholar Crossref Search ADS López A. ( 2011 ), ‘The effect of microaggregation on regression results: an application to Spanish innovation data,’ MPRA Paper, Munich University Library. Mahmood I. P. , Mitchell W. ( 2004 ), ‘ Two faces: effects of business groups on innovation in emerging economies ,’ Management Science , 50 ( 10 ), 1348 – 1365 . Google Scholar Crossref Search ADS Mairesse J. , Mohnen P. ( 2010 ), ‘Using innovation surveys for econometric analysis,’ in Hall B. H. , Rosenberg N. (eds), Handbook of the Economics of Innovation , vol. 2 . North-Holland : Amsterdam , pp. 1129 – 1155 . Mohnen P. , Hall B. H. ( 2013 ), ‘ Innovation and productivity: an update ,’ Eurasian Business Review , 3 , 47 – 65 . Nelson R. R. , Winter S. G. ( 1982 ), An Evolutionary Theory of Economic Change . Harvard University Press : Cambridge, MA . Nickell S. ( 1981 ), ‘ Biases in dynamic models with fixed effects ,’ Econometrica: Journal of the Econometric Society , 49 ( 6 ), 1417 – 1426 . Google Scholar Crossref Search ADS OECD and Eurostat ( 2005 ), Oslo Manual: Guidelines for Collecting and Interpreting Innovation Data: The Measurement of Scientific and Technological Activities , 3 rd edn, OECD Publishing : Paris . Parente P. , Santos Silva J. ( 2016 ), ‘ Quantile regression with clustered data ,’ Journal of Econometric Methods , 5 ( 1 ), 1 – 15 . Google Scholar Crossref Search ADS Peters B. ( 2005 ), ‘Employment effects of different innovation activities: microeconometric evidence,’ ZEW Discussion Papers No. 04-73, ZEW - Center for European Economic Research. Peters B. , Dachs B. , Dünser M. , Hud M. , Köhler C. , Rammer C. ( 2014 ), ‘Firm growth, innovation and the business cycle,’ No. 110577, ZEW - Center for European Economic Research: Mannheim. Pianta M. ( 2005 ), ‘Innovation and employment,’ in Fagerberg D. M. J. , Nelson R. (eds), The Oxford Handbook of Innovation . Oxford University Press : Oxford , pp. 568 – 598 . Ricardo D. ( 1817 ), On the Principles of Political Economy and Taxation . John Murray : London . Roodman D. ( 2009a ), ‘ How to do xtabond2: an introduction to difference and system GMM in Stata ,’ Stata Journal , 9 , 86 – 136 . Google Scholar Crossref Search ADS Roodman D. ( 2009b ), ‘ A note on the theme of too many instruments ,’ Oxford Bulletin of Economics and Statistics , 71 , 135 – 158 . Google Scholar Crossref Search ADS Sargan J. D. ( 1958 ), ‘ The estimation of economic relationships using instrumental variables ,’ Econometrica: Journal of the Econometric Society , 26 ( 3 ), 393 – 415 . Google Scholar Crossref Search ADS Schmid M. , Schneeweiss H. ( 2009 ), ‘ The effect of microaggregation by individual ranking on the estimation of moments ,’ Journal of Econometrics , 153 ( 2 ), 174 – 182 . Google Scholar Crossref Search ADS Segarra A. , Teruel M. ( 2014 ), ‘ High-growth firms and innovation: an empirical analysis for Spanish firms ,’ Small Business Economics , 43 ( 4 ), 805 – 817 . Google Scholar Crossref Search ADS Simonetti R. , Taylor K. , Vivarelli M. ( 2000 ), ‘Modelling the employment impact of innovation,’ in Vivarelli M. , Pianta M. (eds), The Employment Impact of Innovation: Evidence and Policy . Routledge : London , pp. 26 – 43 . Spiezia V. , Vivarelli M. ( 2002 ), ‘Innovation and employment: a critical survey,’ in Greenan N. , L’Horty Y. , Mairesse J. (eds), Productivity, Inequality and the Digital Economy: A Transatlantic Perspective . MIT Press : Cambridge, MA , pp. 101 – 131 . Stock J. H. , Yogo M. ( 2005 ), ‘Testing for weak instruments in linear IV regression,’ in Andrews D. W. K. , Stock J. H. (eds), Identification and inference for econometric models: Essays in honor of Thomas Rothenberg . Cambridge University Press : Cambridge, UK . Teece D. J. ( 1996 ), ‘ Firm organization, industrial structure, and technological innovation ,’ Journal of Economic Behavior and Organization , 31 , 193 – 224 . Google Scholar Crossref Search ADS Teece D. J. , Pisano G. , Shuen A. ( 1997 ), ‘ Dynamic capabilities and strategic management ,’ Strategic Management Journal , 18 ( 7 ), 509 – 533 . Google Scholar Crossref Search ADS Triguero A. , Corcoles D. , Cuerva M. C. ( 2014 ), ‘ Persistence of innovation and firms growth: evidence from a panel of SME and large Spanish manufacturing firms ,’ Small Business Economics , 43 ( 4 ), 787 – 804 . Google Scholar Crossref Search ADS Vivarelli M. ( 1995 ), The Economics of Technology and Employment: Theory and Empirical Evidence . Edward Elgar Publishing : London . Vivarelli M. ( 2014 ), ‘ Innovation, employment and skills in advanced and developing countries: a survey of economic literature ,’ Journal of Economic Issues , 48 , 123 – 154 . Google Scholar Crossref Search ADS Windmeijer F. ( 2005 ), ‘ A finite sample correction for the variance of linear efficient two-step GMM estimators ,’ Journal of Econometrics , 126 ( 1 ), 25 – 51 . Google Scholar Crossref Search ADS Zimmermann V. ( 2009 ), ‘ The impact of innovation on employment in small and medium enterprises with different growth rates ,’ Jahrbücher Für Nationalökonomie Und Statistik , 229 , 313 – 326 . Google Scholar Crossref Search ADS Appendix Panel composition Details on the composition of the panel are reported in Table A1. The number of observations used for estimation reduces due to the inclusion of the lagged dependent variable and to missing patterns in the age variable described in the following. Table A1. Composition of the panel Cons. observations Number of observations Number of firms % firms % cum. firms 2 6891 280 4.27 4.27 3 6441 318 4.85 9.11 4 5989 410 6.25 15.36 5 5553 466 7.10 22.47 6 5087 336 5.12 27.59 7 4751 353 5.38 32.97 8 4398 1031 15.71 48.68 9 3367 3367 51.32 100.00 Total 49,368 6561 100.00 Cons. observations Number of observations Number of firms % firms % cum. firms 2 6891 280 4.27 4.27 3 6441 318 4.85 9.11 4 5989 410 6.25 15.36 5 5553 466 7.10 22.47 6 5087 336 5.12 27.59 7 4751 353 5.38 32.97 8 4398 1031 15.71 48.68 9 3367 3367 51.32 100.00 Total 49,368 6561 100.00 Source: Author’s calculations. Table A1. Composition of the panel Cons. observations Number of observations Number of firms % firms % cum. firms 2 6891 280 4.27 4.27 3 6441 318 4.85 9.11 4 5989 410 6.25 15.36 5 5553 466 7.10 22.47 6 5087 336 5.12 27.59 7 4751 353 5.38 32.97 8 4398 1031 15.71 48.68 9 3367 3367 51.32 100.00 Total 49,368 6561 100.00 Cons. observations Number of observations Number of firms % firms % cum. firms 2 6891 280 4.27 4.27 3 6441 318 4.85 9.11 4 5989 410 6.25 15.36 5 5553 466 7.10 22.47 6 5087 336 5.12 27.59 7 4751 353 5.38 32.97 8 4398 1031 15.71 48.68 9 3367 3367 51.32 100.00 Total 49,368 6561 100.00 Source: Author’s calculations. Representativeness of the sample A number of consistency checks have been carried out, to assess the representativeness of the PITEC database (manufacturing sector) and the extent to which it is comparable with other commonly used data sources. First, total employment in the manufacturing macro-sector (before excluding those firms that experienced contingencies in employment records) has been compared with data from the OECD STAN Database for Structural Analysis. In STAN, information on the Number of person engaged (EMPN) and Number of employees (EMPE) in Spain is available up to 2009. The manufacturing macro-sector in the sample represents about 33% of the Number of employees and about 31% of the Number of person engaged recorded in the OECD STAN database (see Table A2). Table A2. Manufacturing—PITEC vs. OECD STAN Data 2004 2005 2006 2007 2008 2009 2010 2011 2012 PITEC 884,317 968,465 964,562 936,129 935,912 812,232 769,620 744,681 695,964 EMPE 2,899,300 2,925,500 2,904,700 2,873,400 2,840,400 2,422,700 n.a n.a n.a EMPN 3,087,200 3,106,300 3,099,800 3,074,100 3,032,500 2,594,400 n.a n.a n.a % EMPE 30.50 33.10 33.21 32.58 32.95 33.53 n.a n.a n.a % EMPN 28.64 31.18 31.12 30.45 30.86 31.31 n.a n.a n.a Data 2004 2005 2006 2007 2008 2009 2010 2011 2012 PITEC 884,317 968,465 964,562 936,129 935,912 812,232 769,620 744,681 695,964 EMPE 2,899,300 2,925,500 2,904,700 2,873,400 2,840,400 2,422,700 n.a n.a n.a EMPN 3,087,200 3,106,300 3,099,800 3,074,100 3,032,500 2,594,400 n.a n.a n.a % EMPE 30.50 33.10 33.21 32.58 32.95 33.53 n.a n.a n.a % EMPN 28.64 31.18 31.12 30.45 30.86 31.31 n.a n.a n.a Source: Author’s calculations. OECD STAN Database (ISIC Rev. 3) accessed in August 2015. Table A2. Manufacturing—PITEC vs. OECD STAN Data 2004 2005 2006 2007 2008 2009 2010 2011 2012 PITEC 884,317 968,465 964,562 936,129 935,912 812,232 769,620 744,681 695,964 EMPE 2,899,300 2,925,500 2,904,700 2,873,400 2,840,400 2,422,700 n.a n.a n.a EMPN 3,087,200 3,106,300 3,099,800 3,074,100 3,032,500 2,594,400 n.a n.a n.a % EMPE 30.50 33.10 33.21 32.58 32.95 33.53 n.a n.a n.a % EMPN 28.64 31.18 31.12 30.45 30.86 31.31 n.a n.a n.a Data 2004 2005 2006 2007 2008 2009 2010 2011 2012 PITEC 884,317 968,465 964,562 936,129 935,912 812,232 769,620 744,681 695,964 EMPE 2,899,300 2,925,500 2,904,700 2,873,400 2,840,400 2,422,700 n.a n.a n.a EMPN 3,087,200 3,106,300 3,099,800 3,074,100 3,032,500 2,594,400 n.a n.a n.a % EMPE 30.50 33.10 33.21 32.58 32.95 33.53 n.a n.a n.a % EMPN 28.64 31.18 31.12 30.45 30.86 31.31 n.a n.a n.a Source: Author’s calculations. OECD STAN Database (ISIC Rev. 3) accessed in August 2015. Second, the proportion of product and process innovators in the sample has been compared with the Spanish Community Innovation Survey (CIS 4, CIS 2006, CIS 2008, CIS 2010 and CIS 2012).34 Such comparison, reported in Table A3, shows that innovative enterprises are generally over represented in the sample under scrutiny (the proportion of product and/or process innovators in manufacturing is about two times the one recorded in CIS data for Spain). This is linked to differences in the sampling strategies. Table A3. Manufacturing—product and/or process innovative firms (PITEC vs. CIS) Year PITEC (%) CIS (%) Proportion 2004 75.11 36.93 2.03 2005 78.61 n.a. n.a. 2006 78.66 37.21 2.11 2007 76.35 n.a. n.a. 2008 77.04 34.80 2.21 2009 78.43 n.a. n.a. 2010 79.19 33.70 2.35 2011 63.89 n.a. n.a. 2012 58.96 28.51 2.07 Year PITEC (%) CIS (%) Proportion 2004 75.11 36.93 2.03 2005 78.61 n.a. n.a. 2006 78.66 37.21 2.11 2007 76.35 n.a. n.a. 2008 77.04 34.80 2.21 2009 78.43 n.a. n.a. 2010 79.19 33.70 2.35 2011 63.89 n.a. n.a. 2012 58.96 28.51 2.07 Source: Author’s calculations. Table A3. Manufacturing—product and/or process innovative firms (PITEC vs. CIS) Year PITEC (%) CIS (%) Proportion 2004 75.11 36.93 2.03 2005 78.61 n.a. n.a. 2006 78.66 37.21 2.11 2007 76.35 n.a. n.a. 2008 77.04 34.80 2.21 2009 78.43 n.a. n.a. 2010 79.19 33.70 2.35 2011 63.89 n.a. n.a. 2012 58.96 28.51 2.07 Year PITEC (%) CIS (%) Proportion 2004 75.11 36.93 2.03 2005 78.61 n.a. n.a. 2006 78.66 37.21 2.11 2007 76.35 n.a. n.a. 2008 77.04 34.80 2.21 2009 78.43 n.a. n.a. 2010 79.19 33.70 2.35 2011 63.89 n.a. n.a. 2012 58.96 28.51 2.07 Source: Author’s calculations. Descriptive statistics—innovation variables Descriptive statistics of new-to-the-market product innovation and process innovation variables are presented in Table A4. Such descriptive statistics refer to the entire panel, as presented in Table A1.35 Table A4. Summary statistics—innovation variables Variable Mean ProdInn 0.334 ProcInn 0.582 ProdInn (goods) 0.318 ProdInn (services) 0.115 ProcInn (methods) 0.480 ProcInn (logistics) 0.137 ProcInn (auxiliary) 0.294 Variable Mean ProdInn 0.334 ProcInn 0.582 ProdInn (goods) 0.318 ProdInn (services) 0.115 ProcInn (methods) 0.480 ProcInn (logistics) 0.137 ProcInn (auxiliary) 0.294 Source: Author’s calculations. Table A4. Summary statistics—innovation variables Variable Mean ProdInn 0.334 ProcInn 0.582 ProdInn (goods) 0.318 ProdInn (services) 0.115 ProcInn (methods) 0.480 ProcInn (logistics) 0.137 ProcInn (auxiliary) 0.294 Variable Mean ProdInn 0.334 ProcInn 0.582 ProdInn (goods) 0.318 ProdInn (services) 0.115 ProcInn (methods) 0.480 ProcInn (logistics) 0.137 ProcInn (auxiliary) 0.294 Source: Author’s calculations. GMM vs. pooled OLS In this subsection, the main model is estimated also by means of pooled OLS. Columns 1 and 2 of Table 1 are reported for reference. Quantile regression results Estimates at five points of the conditional distribution of the dependent variable (namely, the 15th, 30th, 50th, 70th, and 85th percentiles) are reported below. Panel (a) of Table A6 refers to the main specification, while in panel (b) innovation variables are split in different dummies. Conditional quantiles are estimated separately. Robust and clustered standard errors are reported in parentheses, following Parente and Santos Silva (2016). Table A5. Baseline Dependent variable: Gi,t (1) (2) (OLS) Gi,t−1 −0.052*** −0.051*** −0.024 (0.019) (0.018) (0.017) ProdInni,t 0.015** 0.016*** 0.013*** (0.006) (0.006) (0.002) ProcInni,t 0.004 0.007 0.022*** (0.010) (0.007) (0.002) log(agei,t) −0.056*** −0.056*** −0.006*** (0.021) (0.018) (0.002) groupi,t −0.012 −0.013* 0.004* (0.008) (0.007) (0.002) Industry dummies Yes No Yes Year dummies Yes Yes Yes Observations 28,775 28,775 34,521 Hansen P-value 0.364 0.340 – AR1 P-value 0 0 – AR2 P-value 0.433 0.384 – Number of instruments 57 30 – Dependent variable: Gi,t (1) (2) (OLS) Gi,t−1 −0.052*** −0.051*** −0.024 (0.019) (0.018) (0.017) ProdInni,t 0.015** 0.016*** 0.013*** (0.006) (0.006) (0.002) ProcInni,t 0.004 0.007 0.022*** (0.010) (0.007) (0.002) log(agei,t) −0.056*** −0.056*** −0.006*** (0.021) (0.018) (0.002) groupi,t −0.012 −0.013* 0.004* (0.008) (0.007) (0.002) Industry dummies Yes No Yes Year dummies Yes Yes Yes Observations 28,775 28,775 34,521 Hansen P-value 0.364 0.340 – AR1 P-value 0 0 – AR2 P-value 0.433 0.384 – Number of instruments 57 30 – Notes: Robust (two-step for GMM) standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table A5. Baseline Dependent variable: Gi,t (1) (2) (OLS) Gi,t−1 −0.052*** −0.051*** −0.024 (0.019) (0.018) (0.017) ProdInni,t 0.015** 0.016*** 0.013*** (0.006) (0.006) (0.002) ProcInni,t 0.004 0.007 0.022*** (0.010) (0.007) (0.002) log(agei,t) −0.056*** −0.056*** −0.006*** (0.021) (0.018) (0.002) groupi,t −0.012 −0.013* 0.004* (0.008) (0.007) (0.002) Industry dummies Yes No Yes Year dummies Yes Yes Yes Observations 28,775 28,775 34,521 Hansen P-value 0.364 0.340 – AR1 P-value 0 0 – AR2 P-value 0.433 0.384 – Number of instruments 57 30 – Dependent variable: Gi,t (1) (2) (OLS) Gi,t−1 −0.052*** −0.051*** −0.024 (0.019) (0.018) (0.017) ProdInni,t 0.015** 0.016*** 0.013*** (0.006) (0.006) (0.002) ProcInni,t 0.004 0.007 0.022*** (0.010) (0.007) (0.002) log(agei,t) −0.056*** −0.056*** −0.006*** (0.021) (0.018) (0.002) groupi,t −0.012 −0.013* 0.004* (0.008) (0.007) (0.002) Industry dummies Yes No Yes Year dummies Yes Yes Yes Observations 28,775 28,775 34,521 Hansen P-value 0.364 0.340 – AR1 P-value 0 0 – AR2 P-value 0.433 0.384 – Number of instruments 57 30 – Notes: Robust (two-step for GMM) standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table A6. Quantile regression results (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 (a) Main specification Gi,t−1 0.064*** 0.037*** 0.006*** 0.011*** −0.012 (0.009) (0.005) (0.002) (0.004) (0.009) ProdInni,t 0.018*** 0.011*** 0.003*** 0.006*** 0.011*** (0.003) (0.002) (0.001) (0.001) (0.003) ProcInni,t 0.034*** 0.015*** 0.003*** 0.007*** 0.004 (0.004) (0.002) (0.001) (0.001) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.018*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.445*** −0.182*** −0.087*** −0.010 0.093*** (0.014) (0.017) (0.004) (0.009) (0.023) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.031 0.036 0.033 0.031 0.020 (b) Splitting innovation variables Gi,t−1 0.066*** 0.038*** 0.006** 0.011*** −0.014 (0.010) (0.004) (0.002) (0.004) (0.010) ProdInni,t (goods) 0.019*** 0.010*** 0.003*** 0.006*** 0.010*** (0.004) (0.002) (0.001) (0.002) (0.003) ProdInni,t (services) −0.006 −0.000 0.001 0.002 0.003 (0.005) (0.003) (0.001) (0.003) (0.004) ProcInni,t (methods) 0.024*** 0.010*** 0.002** 0.005*** 0.000 (0.004) (0.002) (0.001) (0.001) (0.002) ProcInni,t (logistics) 0.002 0.001 0.000 −0.000 −0.001 (0.005) (0.002) (0.001) (0.002) (0.003) ProcInni,t (auxiliary) 0.014*** 0.006*** 0.003*** 0.005*** 0.006** (0.003) (0.002) (0.001) (0.002) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.017*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.287*** −0.092*** 0.018*** 0.045*** 0.174*** (0.027) (0.013) (0.007) (0.010) (0.017) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.031 0.035 0.033 0.031 0.020 (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 (a) Main specification Gi,t−1 0.064*** 0.037*** 0.006*** 0.011*** −0.012 (0.009) (0.005) (0.002) (0.004) (0.009) ProdInni,t 0.018*** 0.011*** 0.003*** 0.006*** 0.011*** (0.003) (0.002) (0.001) (0.001) (0.003) ProcInni,t 0.034*** 0.015*** 0.003*** 0.007*** 0.004 (0.004) (0.002) (0.001) (0.001) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.018*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.445*** −0.182*** −0.087*** −0.010 0.093*** (0.014) (0.017) (0.004) (0.009) (0.023) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.031 0.036 0.033 0.031 0.020 (b) Splitting innovation variables Gi,t−1 0.066*** 0.038*** 0.006** 0.011*** −0.014 (0.010) (0.004) (0.002) (0.004) (0.010) ProdInni,t (goods) 0.019*** 0.010*** 0.003*** 0.006*** 0.010*** (0.004) (0.002) (0.001) (0.002) (0.003) ProdInni,t (services) −0.006 −0.000 0.001 0.002 0.003 (0.005) (0.003) (0.001) (0.003) (0.004) ProcInni,t (methods) 0.024*** 0.010*** 0.002** 0.005*** 0.000 (0.004) (0.002) (0.001) (0.001) (0.002) ProcInni,t (logistics) 0.002 0.001 0.000 −0.000 −0.001 (0.005) (0.002) (0.001) (0.002) (0.003) ProcInni,t (auxiliary) 0.014*** 0.006*** 0.003*** 0.005*** 0.006** (0.003) (0.002) (0.001) (0.002) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.017*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.287*** −0.092*** 0.018*** 0.045*** 0.174*** (0.027) (0.013) (0.007) (0.010) (0.017) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.031 0.035 0.033 0.031 0.020 Notes: Robust clustered standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table A6. Quantile regression results (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 (a) Main specification Gi,t−1 0.064*** 0.037*** 0.006*** 0.011*** −0.012 (0.009) (0.005) (0.002) (0.004) (0.009) ProdInni,t 0.018*** 0.011*** 0.003*** 0.006*** 0.011*** (0.003) (0.002) (0.001) (0.001) (0.003) ProcInni,t 0.034*** 0.015*** 0.003*** 0.007*** 0.004 (0.004) (0.002) (0.001) (0.001) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.018*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.445*** −0.182*** −0.087*** −0.010 0.093*** (0.014) (0.017) (0.004) (0.009) (0.023) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.031 0.036 0.033 0.031 0.020 (b) Splitting innovation variables Gi,t−1 0.066*** 0.038*** 0.006** 0.011*** −0.014 (0.010) (0.004) (0.002) (0.004) (0.010) ProdInni,t (goods) 0.019*** 0.010*** 0.003*** 0.006*** 0.010*** (0.004) (0.002) (0.001) (0.002) (0.003) ProdInni,t (services) −0.006 −0.000 0.001 0.002 0.003 (0.005) (0.003) (0.001) (0.003) (0.004) ProcInni,t (methods) 0.024*** 0.010*** 0.002** 0.005*** 0.000 (0.004) (0.002) (0.001) (0.001) (0.002) ProcInni,t (logistics) 0.002 0.001 0.000 −0.000 −0.001 (0.005) (0.002) (0.001) (0.002) (0.003) ProcInni,t (auxiliary) 0.014*** 0.006*** 0.003*** 0.005*** 0.006** (0.003) (0.002) (0.001) (0.002) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.017*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.287*** −0.092*** 0.018*** 0.045*** 0.174*** (0.027) (0.013) (0.007) (0.010) (0.017) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.031 0.035 0.033 0.031 0.020 (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 (a) Main specification Gi,t−1 0.064*** 0.037*** 0.006*** 0.011*** −0.012 (0.009) (0.005) (0.002) (0.004) (0.009) ProdInni,t 0.018*** 0.011*** 0.003*** 0.006*** 0.011*** (0.003) (0.002) (0.001) (0.001) (0.003) ProcInni,t 0.034*** 0.015*** 0.003*** 0.007*** 0.004 (0.004) (0.002) (0.001) (0.001) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.018*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.445*** −0.182*** −0.087*** −0.010 0.093*** (0.014) (0.017) (0.004) (0.009) (0.023) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.031 0.036 0.033 0.031 0.020 (b) Splitting innovation variables Gi,t−1 0.066*** 0.038*** 0.006** 0.011*** −0.014 (0.010) (0.004) (0.002) (0.004) (0.010) ProdInni,t (goods) 0.019*** 0.010*** 0.003*** 0.006*** 0.010*** (0.004) (0.002) (0.001) (0.002) (0.003) ProdInni,t (services) −0.006 −0.000 0.001 0.002 0.003 (0.005) (0.003) (0.001) (0.003) (0.004) ProcInni,t (methods) 0.024*** 0.010*** 0.002** 0.005*** 0.000 (0.004) (0.002) (0.001) (0.001) (0.002) ProcInni,t (logistics) 0.002 0.001 0.000 −0.000 −0.001 (0.005) (0.002) (0.001) (0.002) (0.003) ProcInni,t (auxiliary) 0.014*** 0.006*** 0.003*** 0.005*** 0.006** (0.003) (0.002) (0.001) (0.002) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.017*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.287*** −0.092*** 0.018*** 0.045*** 0.174*** (0.027) (0.013) (0.007) (0.010) (0.017) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.031 0.035 0.033 0.031 0.020 Notes: Robust clustered standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Extension: complementarity of innovation strategies Estimates with a different set of innovation dummies, to take into first account the complementarities existing between product and process innovation strategies, are presented in Tables A7 and A8. See the main body of text for detailed definitions. Table A7. GMM estimates—complementarity of innovation strategies Dependent variable: Gi,t (1) (2) Gi,t−1 −0.052*** −0.050*** (0.019) (0.019) ProdInni,t 0.031*** 0.036*** (0.011) (0.010) ProcInni,t 0.011 0.015* (0.009) (0.008) ProdInni,t and ProcInni,t 0.018 0.026*** (0.012) (0.009) log(agei,t) −0.049** −0.055*** (0.022) (0.018) groupi,t −0.011 −0.013* (0.008) (0.007) Industry dummies Yes No Year dummies Yes Yes Observations 28,775 28,775 Hansen P-value 0.119 0.0903 AR1 P-value 0 0 AR2 P-value 0.495 0.396 Number of instruments 65 38 Dependent variable: Gi,t (1) (2) Gi,t−1 −0.052*** −0.050*** (0.019) (0.019) ProdInni,t 0.031*** 0.036*** (0.011) (0.010) ProcInni,t 0.011 0.015* (0.009) (0.008) ProdInni,t and ProcInni,t 0.018 0.026*** (0.012) (0.009) log(agei,t) −0.049** −0.055*** (0.022) (0.018) groupi,t −0.011 −0.013* (0.008) (0.007) Industry dummies Yes No Year dummies Yes Yes Observations 28,775 28,775 Hansen P-value 0.119 0.0903 AR1 P-value 0 0 AR2 P-value 0.495 0.396 Number of instruments 65 38 Notes: Robust two-step standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table A7. GMM estimates—complementarity of innovation strategies Dependent variable: Gi,t (1) (2) Gi,t−1 −0.052*** −0.050*** (0.019) (0.019) ProdInni,t 0.031*** 0.036*** (0.011) (0.010) ProcInni,t 0.011 0.015* (0.009) (0.008) ProdInni,t and ProcInni,t 0.018 0.026*** (0.012) (0.009) log(agei,t) −0.049** −0.055*** (0.022) (0.018) groupi,t −0.011 −0.013* (0.008) (0.007) Industry dummies Yes No Year dummies Yes Yes Observations 28,775 28,775 Hansen P-value 0.119 0.0903 AR1 P-value 0 0 AR2 P-value 0.495 0.396 Number of instruments 65 38 Dependent variable: Gi,t (1) (2) Gi,t−1 −0.052*** −0.050*** (0.019) (0.019) ProdInni,t 0.031*** 0.036*** (0.011) (0.010) ProcInni,t 0.011 0.015* (0.009) (0.008) ProdInni,t and ProcInni,t 0.018 0.026*** (0.012) (0.009) log(agei,t) −0.049** −0.055*** (0.022) (0.018) groupi,t −0.011 −0.013* (0.008) (0.007) Industry dummies Yes No Year dummies Yes Yes Observations 28,775 28,775 Hansen P-value 0.119 0.0903 AR1 P-value 0 0 AR2 P-value 0.495 0.396 Number of instruments 65 38 Notes: Robust two-step standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table A8. Quantile regression—complementarity of innovation strategies (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 Gi,t−1 0.064*** 0.037*** 0.006*** 0.011*** −0.013 (0.009) (0.004) (0.002) (0.004) (0.010) ProdInni,t 0.038*** 0.021*** 0.003** 0.008*** 0.015*** (0.008) (0.004) (0.001) (0.003) (0.005) ProcInni,t 0.040*** 0.018*** 0.003*** 0.007*** 0.005* (0.005) (0.002) (0.001) (0.001) (0.003) ProdInni,t and ProcInni,t 0.053*** 0.026*** 0.006*** 0.013*** 0.015*** (0.005) (0.003) (0.001) (0.002) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.018*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.398*** −0.162*** −0.080*** 0.018** 0.122*** (0.013) (0.017) (0.005) (0.009) (0.024) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.032 0.036 0.033 0.031 0.020 (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 Gi,t−1 0.064*** 0.037*** 0.006*** 0.011*** −0.013 (0.009) (0.004) (0.002) (0.004) (0.010) ProdInni,t 0.038*** 0.021*** 0.003** 0.008*** 0.015*** (0.008) (0.004) (0.001) (0.003) (0.005) ProcInni,t 0.040*** 0.018*** 0.003*** 0.007*** 0.005* (0.005) (0.002) (0.001) (0.001) (0.003) ProdInni,t and ProcInni,t 0.053*** 0.026*** 0.006*** 0.013*** 0.015*** (0.005) (0.003) (0.001) (0.002) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.018*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.398*** −0.162*** −0.080*** 0.018** 0.122*** (0.013) (0.017) (0.005) (0.009) (0.024) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.032 0.036 0.033 0.031 0.020 Notes: Robust clustered standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table A8. Quantile regression—complementarity of innovation strategies (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 Gi,t−1 0.064*** 0.037*** 0.006*** 0.011*** −0.013 (0.009) (0.004) (0.002) (0.004) (0.010) ProdInni,t 0.038*** 0.021*** 0.003** 0.008*** 0.015*** (0.008) (0.004) (0.001) (0.003) (0.005) ProcInni,t 0.040*** 0.018*** 0.003*** 0.007*** 0.005* (0.005) (0.002) (0.001) (0.001) (0.003) ProdInni,t and ProcInni,t 0.053*** 0.026*** 0.006*** 0.013*** 0.015*** (0.005) (0.003) (0.001) (0.002) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.018*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.398*** −0.162*** −0.080*** 0.018** 0.122*** (0.013) (0.017) (0.005) (0.009) (0.024) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.032 0.036 0.033 0.031 0.020 (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 Gi,t−1 0.064*** 0.037*** 0.006*** 0.011*** −0.013 (0.009) (0.004) (0.002) (0.004) (0.010) ProdInni,t 0.038*** 0.021*** 0.003** 0.008*** 0.015*** (0.008) (0.004) (0.001) (0.003) (0.005) ProcInni,t 0.040*** 0.018*** 0.003*** 0.007*** 0.005* (0.005) (0.002) (0.001) (0.001) (0.003) ProdInni,t and ProcInni,t 0.053*** 0.026*** 0.006*** 0.013*** 0.015*** (0.005) (0.003) (0.001) (0.002) (0.003) log(agei,t) 0.023*** 0.004*** −0.004*** −0.014*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.018*** 0.005*** −0.002*** −0.003** −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.398*** −0.162*** −0.080*** 0.018** 0.122*** (0.013) (0.017) (0.005) (0.009) (0.024) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.032 0.036 0.033 0.031 0.020 Notes: Robust clustered standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Robustness: GMM - endogenous innovation variables Estimates specifying innovation variables as endogenous are reported in Table A9, for reference only. In Columns (1) and (3) other controls are specified as exogenous, as in Table 1; in Columns (2) and (4) group is predetermined. Table A9. GMM estimates—endogenous innovation variables Dependent variable: Gi,t (1) (2) (3) (4) Gi,t−1 −0.043** −0.037* −0.051*** −0.048*** (0.021) (0.020) (0.018) (0.018) ProdInni,t 0.036* 0.036** 0.016 0.018* (0.021) (0.017) (0.010) (0.010) ProcInni,t 0.005 0.005 0.002 0.001 (0.010) (0.009) (0.008) (0.008) log(agei,t) −0.090** −0.087*** −0.056*** −0.054*** (0.037) (0.031) (0.018) (0.018) groupi,t −0.020** 0.045 −0.013* 0.028 (0.010) (0.031) (0.007) (0.027) Industry dummies Yes Yes No No Year dummies Yes Yes Yes Yes Observations 28,775 28,775 28,775 28,775 Hansen P-value 0.286 0.350 0.225 0.259 AR1 P-value 0 0 0 0 AR2 P-value 0.409 0.275 0.387 0.340 Number of instruments 55 61 28 34 Dependent variable: Gi,t (1) (2) (3) (4) Gi,t−1 −0.043** −0.037* −0.051*** −0.048*** (0.021) (0.020) (0.018) (0.018) ProdInni,t 0.036* 0.036** 0.016 0.018* (0.021) (0.017) (0.010) (0.010) ProcInni,t 0.005 0.005 0.002 0.001 (0.010) (0.009) (0.008) (0.008) log(agei,t) −0.090** −0.087*** −0.056*** −0.054*** (0.037) (0.031) (0.018) (0.018) groupi,t −0.020** 0.045 −0.013* 0.028 (0.010) (0.031) (0.007) (0.027) Industry dummies Yes Yes No No Year dummies Yes Yes Yes Yes Observations 28,775 28,775 28,775 28,775 Hansen P-value 0.286 0.350 0.225 0.259 AR1 P-value 0 0 0 0 AR2 P-value 0.409 0.275 0.387 0.340 Number of instruments 55 61 28 34 Robust two-step standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table A9. GMM estimates—endogenous innovation variables Dependent variable: Gi,t (1) (2) (3) (4) Gi,t−1 −0.043** −0.037* −0.051*** −0.048*** (0.021) (0.020) (0.018) (0.018) ProdInni,t 0.036* 0.036** 0.016 0.018* (0.021) (0.017) (0.010) (0.010) ProcInni,t 0.005 0.005 0.002 0.001 (0.010) (0.009) (0.008) (0.008) log(agei,t) −0.090** −0.087*** −0.056*** −0.054*** (0.037) (0.031) (0.018) (0.018) groupi,t −0.020** 0.045 −0.013* 0.028 (0.010) (0.031) (0.007) (0.027) Industry dummies Yes Yes No No Year dummies Yes Yes Yes Yes Observations 28,775 28,775 28,775 28,775 Hansen P-value 0.286 0.350 0.225 0.259 AR1 P-value 0 0 0 0 AR2 P-value 0.409 0.275 0.387 0.340 Number of instruments 55 61 28 34 Dependent variable: Gi,t (1) (2) (3) (4) Gi,t−1 −0.043** −0.037* −0.051*** −0.048*** (0.021) (0.020) (0.018) (0.018) ProdInni,t 0.036* 0.036** 0.016 0.018* (0.021) (0.017) (0.010) (0.010) ProcInni,t 0.005 0.005 0.002 0.001 (0.010) (0.009) (0.008) (0.008) log(agei,t) −0.090** −0.087*** −0.056*** −0.054*** (0.037) (0.031) (0.018) (0.018) groupi,t −0.020** 0.045 −0.013* 0.028 (0.010) (0.031) (0.007) (0.027) Industry dummies Yes Yes No No Year dummies Yes Yes Yes Yes Observations 28,775 28,775 28,775 28,775 Hansen P-value 0.286 0.350 0.225 0.259 AR1 P-value 0 0 0 0 AR2 P-value 0.409 0.275 0.387 0.340 Number of instruments 55 61 28 34 Robust two-step standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Robustness: quantile regression - lagged innovation variables The quantile regression estimates have been replicated in Table A10, panels (a) and (b), substituting to the innovation dummies their first lag, to take into (partial) account simultaneity issues. Table A10. Quantile regression—lagged innovation variables (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 (a) Main specification Gi,t−1 0.064*** 0.037*** 0.006*** 0.014*** −0.011 (0.009) (0.006) (0.002) (0.004) (0.009) ProdInni,t−1 0.014*** 0.008*** 0.002*** 0.005*** 0.008*** (0.003) (0.002) (0.001) (0.001) (0.002) ProcInni,t−1 0.029*** 0.013*** 0.002*** 0.003** −0.004 (0.004) (0.002) (0.001) (0.001) (0.002) log(agei,t) 0.025*** 0.005*** −0.003*** −0.013*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.019*** 0.006*** −0.002*** −0.003* −0.009*** (0.003) (0.002) (0.001) (0.001) (0.002) Constant −0.444*** −0.193*** −0.087*** −0.017* 0.092*** (0.013) (0.017) (0.004) (0.009) (0.023) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.029 0.034 0.032 0.029 0.019 (b) Splitting innovation variables Gi,t−1 0.067*** 0.038*** 0.006*** 0.013*** −0.012 (0.010) (0.006) (0.002) (0.004) (0.009) ProdInni,t−1 (goods) 0.014*** 0.007*** 0.002** 0.004** 0.006** (0.004) (0.002) (0.001) (0.002) (0.003) ProdInni,t−1 (services) 0.004 0.002 0.001 0.004 0.008* (0.005) (0.003) (0.001) (0.003) (0.004) ProcInni,t−1 (methods) 0.020*** 0.010*** 0.001* 0.001 −0.005** (0.004) (0.002) (0.001) (0.001) (0.003) ProcInni,t−1 (logistics) 0.000 0.001 0.000 −0.000 0.002 (0.005) (0.002) (0.001) (0.002) (0.004) ProcInni,t−1 (auxiliary) 0.008** 0.002 0.001 0.002 −0.001 (0.004) (0.002) (0.001) (0.001) (0.003) log(agei,t) 0.025*** 0.004*** −0.004*** −0.013*** −0.038*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.017*** 0.006*** −0.002*** −0.003* −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.373*** −0.158*** −0.077*** 0.014 0.121*** (0.012) (0.017) (0.005) (0.009) (0.024) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.029 0.034 0.032 0.029 0.018 (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 (a) Main specification Gi,t−1 0.064*** 0.037*** 0.006*** 0.014*** −0.011 (0.009) (0.006) (0.002) (0.004) (0.009) ProdInni,t−1 0.014*** 0.008*** 0.002*** 0.005*** 0.008*** (0.003) (0.002) (0.001) (0.001) (0.002) ProcInni,t−1 0.029*** 0.013*** 0.002*** 0.003** −0.004 (0.004) (0.002) (0.001) (0.001) (0.002) log(agei,t) 0.025*** 0.005*** −0.003*** −0.013*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.019*** 0.006*** −0.002*** −0.003* −0.009*** (0.003) (0.002) (0.001) (0.001) (0.002) Constant −0.444*** −0.193*** −0.087*** −0.017* 0.092*** (0.013) (0.017) (0.004) (0.009) (0.023) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.029 0.034 0.032 0.029 0.019 (b) Splitting innovation variables Gi,t−1 0.067*** 0.038*** 0.006*** 0.013*** −0.012 (0.010) (0.006) (0.002) (0.004) (0.009) ProdInni,t−1 (goods) 0.014*** 0.007*** 0.002** 0.004** 0.006** (0.004) (0.002) (0.001) (0.002) (0.003) ProdInni,t−1 (services) 0.004 0.002 0.001 0.004 0.008* (0.005) (0.003) (0.001) (0.003) (0.004) ProcInni,t−1 (methods) 0.020*** 0.010*** 0.001* 0.001 −0.005** (0.004) (0.002) (0.001) (0.001) (0.003) ProcInni,t−1 (logistics) 0.000 0.001 0.000 −0.000 0.002 (0.005) (0.002) (0.001) (0.002) (0.004) ProcInni,t−1 (auxiliary) 0.008** 0.002 0.001 0.002 −0.001 (0.004) (0.002) (0.001) (0.001) (0.003) log(agei,t) 0.025*** 0.004*** −0.004*** −0.013*** −0.038*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.017*** 0.006*** −0.002*** −0.003* −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.373*** −0.158*** −0.077*** 0.014 0.121*** (0.012) (0.017) (0.005) (0.009) (0.024) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.029 0.034 0.032 0.029 0.018 Notes: Robust clustered standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. Table A10. Quantile regression—lagged innovation variables (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 (a) Main specification Gi,t−1 0.064*** 0.037*** 0.006*** 0.014*** −0.011 (0.009) (0.006) (0.002) (0.004) (0.009) ProdInni,t−1 0.014*** 0.008*** 0.002*** 0.005*** 0.008*** (0.003) (0.002) (0.001) (0.001) (0.002) ProcInni,t−1 0.029*** 0.013*** 0.002*** 0.003** −0.004 (0.004) (0.002) (0.001) (0.001) (0.002) log(agei,t) 0.025*** 0.005*** −0.003*** −0.013*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.019*** 0.006*** −0.002*** −0.003* −0.009*** (0.003) (0.002) (0.001) (0.001) (0.002) Constant −0.444*** −0.193*** −0.087*** −0.017* 0.092*** (0.013) (0.017) (0.004) (0.009) (0.023) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.029 0.034 0.032 0.029 0.019 (b) Splitting innovation variables Gi,t−1 0.067*** 0.038*** 0.006*** 0.013*** −0.012 (0.010) (0.006) (0.002) (0.004) (0.009) ProdInni,t−1 (goods) 0.014*** 0.007*** 0.002** 0.004** 0.006** (0.004) (0.002) (0.001) (0.002) (0.003) ProdInni,t−1 (services) 0.004 0.002 0.001 0.004 0.008* (0.005) (0.003) (0.001) (0.003) (0.004) ProcInni,t−1 (methods) 0.020*** 0.010*** 0.001* 0.001 −0.005** (0.004) (0.002) (0.001) (0.001) (0.003) ProcInni,t−1 (logistics) 0.000 0.001 0.000 −0.000 0.002 (0.005) (0.002) (0.001) (0.002) (0.004) ProcInni,t−1 (auxiliary) 0.008** 0.002 0.001 0.002 −0.001 (0.004) (0.002) (0.001) (0.001) (0.003) log(agei,t) 0.025*** 0.004*** −0.004*** −0.013*** −0.038*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.017*** 0.006*** −0.002*** −0.003* −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.373*** −0.158*** −0.077*** 0.014 0.121*** (0.012) (0.017) (0.005) (0.009) (0.024) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.029 0.034 0.032 0.029 0.018 (1) (2) (3) (4) (5) Quantile 0.15 0.30 0.50 0.70 0.85 (a) Main specification Gi,t−1 0.064*** 0.037*** 0.006*** 0.014*** −0.011 (0.009) (0.006) (0.002) (0.004) (0.009) ProdInni,t−1 0.014*** 0.008*** 0.002*** 0.005*** 0.008*** (0.003) (0.002) (0.001) (0.001) (0.002) ProcInni,t−1 0.029*** 0.013*** 0.002*** 0.003** −0.004 (0.004) (0.002) (0.001) (0.001) (0.002) log(agei,t) 0.025*** 0.005*** −0.003*** −0.013*** −0.039*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.019*** 0.006*** −0.002*** −0.003* −0.009*** (0.003) (0.002) (0.001) (0.001) (0.002) Constant −0.444*** −0.193*** −0.087*** −0.017* 0.092*** (0.013) (0.017) (0.004) (0.009) (0.023) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.029 0.034 0.032 0.029 0.019 (b) Splitting innovation variables Gi,t−1 0.067*** 0.038*** 0.006*** 0.013*** −0.012 (0.010) (0.006) (0.002) (0.004) (0.009) ProdInni,t−1 (goods) 0.014*** 0.007*** 0.002** 0.004** 0.006** (0.004) (0.002) (0.001) (0.002) (0.003) ProdInni,t−1 (services) 0.004 0.002 0.001 0.004 0.008* (0.005) (0.003) (0.001) (0.003) (0.004) ProcInni,t−1 (methods) 0.020*** 0.010*** 0.001* 0.001 −0.005** (0.004) (0.002) (0.001) (0.001) (0.003) ProcInni,t−1 (logistics) 0.000 0.001 0.000 −0.000 0.002 (0.005) (0.002) (0.001) (0.002) (0.004) ProcInni,t−1 (auxiliary) 0.008** 0.002 0.001 0.002 −0.001 (0.004) (0.002) (0.001) (0.001) (0.003) log(agei,t) 0.025*** 0.004*** −0.004*** −0.013*** −0.038*** (0.003) (0.002) (0.001) (0.001) (0.002) groupi,t 0.017*** 0.006*** −0.002*** −0.003* −0.010*** (0.004) (0.002) (0.001) (0.001) (0.003) Constant −0.373*** −0.158*** −0.077*** 0.014 0.121*** (0.012) (0.017) (0.005) (0.009) (0.024) Industry dummies Yes Yes Yes Yes Yes Year dummies Yes Yes Yes Yes Yes Observations 34,521 34,521 34,521 34,521 34,521 Pseudo R-squared 0.029 0.034 0.032 0.029 0.018 Notes: Robust clustered standard errors in parentheses. *** P <0.01; ** P <0.05; * P <0.1. © The Author(s) 2018. Published by Oxford University Press on behalf of Associazione ICC. All rights reserved. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Industrial and Corporate Change – Oxford University Press
Published: Feb 1, 2019
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”
Daniel C.
“Whoa! It’s like Spotify but for academic articles.”
@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”
@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”
@JoseServera
DeepDyve Freelancer | DeepDyve Pro | |
---|---|---|
Price | FREE | $49/month |
Save searches from | ||
Create folders to | ||
Export folders, citations | ||
Read DeepDyve articles | Abstract access only | Unlimited access to over |
20 pages / month | ||
PDF Discount | 20% off | |
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
EndNote
Export to EndNoteAll DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.
ok to continue