The Dynamic Relation Between Returns and Idiosyncratic Volatility

Xiaoquan Jiang and Bong‐Soo Lee

Financial Management, 2006, vol. 35, issue 2, 43-65

Abstract: We claim that regressing excess returns on one‐lagged volatility provides only a limited picture of the dynamic effect of idiosyncratic risk, which tends to be persistent over time. By correcting for the serial correlation in idiosyncratic volatility, we find that idiosyncratic volatility has a significant positive effect. This finding seems robusrt for various firm size portfolios, sample periods, and measures of idiosyncratic risk. Our findings suggest stock markets mis‐price idiosyncratic risk. There may be some measurement problems with idiosyncratic risk. There may be some measurement problems with idiosyncratic risk that could be related to nondiversifiable risk.

Date: 2006
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