Reflections on the Efficient Market Hypothesis: 30 Years Later

Burton G. Malkiel

The Financial Review, 2005, vol. 40, issue 1, 1-9

Abstract: In recent years financial economists have increasingly questioned the efficient market hypothesis. But surely if market prices were often irrational and if market returns were as predictable as some critics have claimed, then professionally managed investment funds should easily be able to outdistance a passive index fund. This paper shows that professional investment managers, both in The U.S. and abroad, do not outperform their index benchmarks and provides evidence that by and large market prices do seem to reflect all available information.

Date: 2005
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