DP10681 An Intertemporal CAPM with Stochastic Volatility

Author(s):	John Y Campbell, Stefano W Giglio, Christopher Polk, Robert Turley
Publication Date:	June 2015
Keyword(s):	ICAPM, stochastic volatility, time-varying expected returns, value premium
JEL(s):	G12, N22
Programme Areas:	Financial Economics
Link to this Page:	cepr.org/active/publications/discussion_papers/dp.php?dpno=10681

This paper studies the pricing of volatility risk using the first-order conditions of a long-term equity investor who is content to hold the aggregate equity market rather than tilting towards value stocks and other equity portfolios that are attractive to short-term investors. We show that a conservative long-term investor will avoid such overweights in order to hedge against two types of deterioration in investment opportunities: declining expected stock returns, and increasing volatility. Empirically, we present novel evidence that low-frequency movements in equity volatility, tied to the default spread, are priced in the cross-section of stock returns.