Many markets involve two groups of agents who interact via “platforms,“ where one group's benefit from joining a platform depends on the size of the other group that joins the platform. I present three models of such markets: a monopoly platform; a model of competing platforms where agents join a single platform; and a model of “competitive bottlenecks” where one group joins all platforms. The determinants of equilibrium prices are (i) the magnitude of the cross‐group externalities, (ii) whether fees are levied on a lump‐sum or per‐transaction basis, and (iii) whether agents join one platform or several platforms.
The Rand Journal of Economics – Wiley
Published: Sep 1, 2006
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