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Discussion Paper Details

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Title: Idiosyncratic Return Volatility in the Cross-Section of Stocks

Author(s): Namho Kang, Péter Kondor and Ronnie Sadka

Publication Date: April 2011

Keyword(s): Hedge funds, idiosyncratic risk and limits to arbitrage

Programme Area(s): Financial Economics

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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Bibliographic Reference

Kang, N, Kondor, P and Sadka, R. 2011. 'Idiosyncratic Return Volatility in the Cross-Section of Stocks'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=8307