The Good, Bad, and Volatility Beta: A Generalized CAPM

Ivan Shaliastovich, Dana Kiku, Amir Yaron and Ravi Bansal
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Ivan Shaliastovich: The Wharton School
Dana Kiku: The Wharton School
Amir Yaron: The Wharton School & NBER

No 1197, 2011 Meeting Papers from Society for Economic Dynamics

Abstract: In this paper we develop an economic asset pricing framework that identifies three key sources of risk that underlie the risk and return tradeoff in the economy: news to cashflows, news to expected returns, and news to aggregate volatility. A novel contribution of this paper is the inclusion of time-varying volatility news which has both important theoretical and empirical implications. Motivated by a Long Run Risk framework, we theoretically show that to consistently identify and explain the time series and cross sectional variation in risk premia it is essential to allow for time varying economic uncertainty in the model. Empirically, we show that the exposure of assets to volatility risk, sorted by size and book to market, line up vary well with those assets' average excess return in the data. The model's fit of a broad cross section of asset returns is about 90\% of which the volatility news factor contributes 20\%. The volatility component plays a significant role in explaining the level of the premium as well as the value and size spreads.

Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:red:sed011:1197

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