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Consumption and Portfolio Decisions When Expected Returns are Time Varying

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John Y. Campbell
Luis M. Viceira

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Abstract

This paper proposes and implements a new approach to a classic unsolved problem in financial economics: the optimal consumption and portfolio choice problem of a long-lived investor facing time-varying investment opportunities. The investor is assumed to be infinitely-lived, to have recursive Epstein-Zin-Weil utility, and to choose in discrete time between a riskless asset with a constant return, and a risky asset with constant return variance whose expected log return follows and AR(1) process. The paper approximates the choice problem by log-linearizing the budget constraint and Euler equations, and derives an analytical solution to the approximate problem. When the model is calibrated to US stock market data it implies that intertemporal hedging motives greatly increase, and may even double, the average demand for stocks by investors whose risk-aversion coefficients exceed one.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 5857.

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Date of creation: Dec 1996
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Handle: RePEc:nbr:nberwo:5857

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G12 - Financial Economics - - General Financial Markets - - - Asset Pricing

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