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Idiosyncratic Return Volatility in the Cross-Section of Stocks

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  • Kang, Namho
  • Kondor, Péter
  • Sadka, Ronnie

Abstract

This paper uncovers the changes in the cross-sectional distribution of idiosyncratic volatility of stocks over the period 1963--2008. The contribution of the top decile to the total market idiosyncratic volatility increased, while the contribution of the bottom decile decreased. We introduce a simple theoretical model showing that larger capital of Long/Short-Equity funds further exacerbates large idiosyncratic shocks but attenuates small idiosyncratic shocks. This effect is stronger for more illiquid stocks. Time-series and cross-sectional results are consistent with the predictions of the model. The results are robust to industry affiliation, stock liquidity, firm size, firm leverage, as well as sign of price change. These findings highlight the roll of hedge funds and other institutional investors in explaining the dynamics of extreme realizations in the cross-section of returns.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 8307.

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Date of creation: Apr 2011
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Handle: RePEc:cpr:ceprdp:8307

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Keywords: Hedge funds; idiosyncratic risk; limits to arbitrage;

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