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ABSTRACT In an efficient market, the fundamental value of a security fluctuates randomly. However, trading costs induce negative serial dependence in successive observed market price changes. In fact, given market efficiency, the effective bid‐ask spread can be measured by where “cov” is the first‐order serial covariance of price changes. This implicit measure of the bid‐ask spread is derived formally and is shown empirically to be closely related to firm size.
The Journal of Finance – Wiley
Published: Sep 1, 1984
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