Finance pp 127-134 | Cite as

Efficient Market Hypothesis

  • Burton G. Malkiel
Part of the The New Palgrave book series (NPA)


A capital market is said to be efficient if it fully and correctly reflects all relevant information in determining security prices. Formally, the market is said to be efficient with respect to some information set, ϕ, if security prices would be unaffected by revealing that information to all participants. Moreover, efficiency with respect to an information set, ϕ, implies that it is impossible to make economic profits by trading on the basis of ϕ.


Stock Price Abnormal Return Price Change Mutual Fund Financial Economic 
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© Palgrave Macmillan, a division of Macmillan Publishers Limited 1989

Authors and Affiliations

  • Burton G. Malkiel

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