Individual Investors and Volatility - HEC Paris - École des hautes études commerciales de Paris Access content directly
Reports Year : 2008

Individual Investors and Volatility


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.


No file

Dates and versions

hal-00578370 , version 1 (19-03-2011)


  • HAL Id : hal-00578370 , version 1


Thierry Foucault, David Thesmar, David Sraer. Individual Investors and Volatility: (ex Chaining up noise traders). 2008. ⟨hal-00578370⟩


122 View
0 Download


Gmail Mastodon Facebook X LinkedIn More