Risk and Return: Consumption versus Market Beta

N. Gregory Mankiw and Matthew D. Shapiro

No 1399, NBER Working Papers from National Bureau of Economic Research, Inc

Abstract: The interaction between the macroeconomy and asset markets is central to a variety of modern theories of the business cycle. Much recentwork emphasizes the joint nature of the consumption decision and the portfolio allocation decision. In this paper, we compare two formulations of the Capital Asset Pricing Model. The traditional CAPM suggests that the appropriate measure of an asset's risk is the covariance of the asset's return with the market return. The consumption CAPM, on the other hand, implies that a better measure of risk is the covariance with aggregate consumption growth. We examine a cross section of 464 stocks and find that the beta measured with respect to a stock market index outperforms the beta measured with respect to consumption growth.

Date: 1984-07
Note: EFG
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Published as Mankiw, N. Gregory and Matthew D. Shapiro. "Risk and Return: Consumption Beta versus Market Beta," Review of Economics and Statistics, Vol. 68, No. 3, August 1986, pp. 452-459.

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