MOME in Hindsight
Ronald J. Gilson
Stanford Law School; Columbia Law School; European Corporate Governance Institute (ECGI)
Harvard Law School; European Corporate Governance Institute
Regulation, Vol. 27, No. 4, pp. 64-72, Winter 2004
Two decades ago, the Virginia Law Review published our article "The Mechanisms of Market Efficiency" (MOME), in which we tried to discern the institutional underpinnings of financial market efficiency. We concluded that the level of market efficiency with respect to a particular fact depends on which of several market mechanisms - universally informed trading, professionally informed trading, derivatively informed trading, and uninformed trading operates to reflect that fact in market price. Revisiting our article is particularly appropriate today. A new framework for evaluating the efficiency of the stock market, called "behavioral finance," and a growing number of empirical studies pose a serious challenge to the Efficient Markets Hypothesis. Twenty years have made us appropriately more skeptical of the efficiency of those institutions.
Number of Pages in PDF File: 9
Keywords: Market efficiency, financial market efficiency, universally informed trading, professionally informed trading, derivatievly informed trading, uninformed trading, behavioral finance, efficients markets hypothesis, securities and exchange, capital asset prices, capital markets, valuation
JEL Classification: G10, G14, G28
Date posted: January 26, 2005
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