Efficient Markets Hypothesis
THE NEW PALGRAVE: A DICTIONARY OF ECONOMICS, L. Blume, S. Durlauf, eds., 2nd Edition, Palgrave Macmillan Ltd., 2007
28 Pages Posted: 6 Jun 2007
Abstract
The efficient markets hypothesis (EMH) maintains that market prices fully reflect all available information. Developed independently by Paul A. Samuelson and Eugene F. Fama in the 1960s, this idea has been applied extensively to theoretical models and empirical studies of financial securities prices, generating considerable controversy as well as fundamental insights into the price-discovery process. The most enduring critique comes from psychologists and behavioural economists who argue that the EMH is based on counterfactual assumptions regarding human behaviour, that is, rationality. Recent advances in evolutionary psychology and the cognitive neurosciences may be able to reconcile the EMH with behavioural anomalies.
Keywords: Market Efficiency, Behavioral Finance
JEL Classification: G10, G12, G14
Suggested Citation: Suggested Citation
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