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Federal Reserve Bank of San Francisco
Working Paper Series
The Social Cost of Near-Rational Investment
Tarek A. Hassan
Thomas M. Mertens

We show that the stock market may fail to aggregate information even if it appears to be efficient, and that the resulting decrease in the information content of prices may drastically reduce welfare. We solve a macroeconomic model in which information about fundamentals is dispersed and households make small, correlated errors when forming expectations about future productivity. As information aggregates in the market, these errors amplify and crowd out the information content of stock prices. When prices reflect less information, the conditional variance of stock returns rises, causing an increase in uncertainty and costly distortions in consumption, capital accumulation, and labor supply.

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Tarek A. Hassan & Thomas M. Mertens, The Social Cost of Near-Rational Investment, Federal Reserve Bank of San Francisco, Working Paper Series 2016-16, 12 Aug 2016.
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DOI: 10.24148/wp2016-16
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