Symmetric and Asymmetric Market Betas and Downside Risk

Yaron Levi, Ivo Welch and Andrew Karolyi

The Review of Financial Studies, 2020, vol. 33, issue 6, 2772-2795

Abstract: Our paper explores whether a symmetric plain or an asymmetric down-beta is a better hedging measure (Roy 1952; Markowitz 1959). Unlike Ang, Chen, and Xing (2006) and Lettau, Maggiori, and Weber (2014), we find that the prevailing plain market beta is the better predictor, even for crashes. It also predicts the subsequent down-beta (i.e., beta measured only on days when the stock market had declined) better than down-beta itself. Stocks with higher down-betas ex ante also do not earn higher average rates of return ex post. Thus, down-betas are useful for neither hedging nor risk-pricing purposes.

Date: 2020
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