Individual Investors and Volatility

Thierry Foucault, David Thesmar and David Sraer

Working Papers from HAL

Abstract: We test the hypothesis that individual investors contribute to the idiosyncratic volatility of stock returns because they act as noise traders. To this end, we consider a reform that makes short selling or buying on margin more expensive for retail investors relative to institutions, for a subset of French stocks. If retail investors are noise traders, theory implies that the volatility of stocks affected by the reform should decrease relative to other stocks. This prediction is borne out by the data. Moreover, around the reform, we observe a significant decrease in (i) the magnitude of returns reversals, and (ii) the Amihud ratio for the stocks a¤ected by the reform relative to other stocks. We show that these findings are also consistent with models in which individual investors, acting as noise traders, are a source of volatility.

Keywords: Idiosyncratic volatility; Retail investors; Noise trading (search for similar items in EconPapers)
Date: 2008-07
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Citations: View citations in EconPapers (2)

Published in 2008

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Related works:
Journal Article: Individual Investors and Volatility (2011)
Working Paper: Individual Investors and Volatility (2011)
Working Paper: Individual Investors and Volatility (2008)
Working Paper: Individual investors and volatility (2008)
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Persistent link: https://EconPapers.repec.org/RePEc:hal:wpaper:hal-00578370

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