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Individual Investors and Volatility

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  • Foucault, Thierry
  • Sraer, David
  • Thesmar, David

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 affected 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.

Suggested Citation

  • Foucault, Thierry & Sraer, David & Thesmar, David, 2008. "Individual Investors and Volatility," CEPR Discussion Papers 6915, C.E.P.R. Discussion Papers.
  • Handle: RePEc:cpr:ceprdp:6915
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    Keywords

    Idiosyncratic volatility; Noise trading; Retail investors;

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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