Two Puzzles of Asset Pricing and Their Implications for Investors

doi:10.1017/CBO9780511754357.007

4 - Two Puzzles of Asset Pricing and Their Implications for Investors

Published online by Cambridge University Press: 06 July 2010

John Y. Campbell

Edited by

Michael Szenberg and

Lall Ramrattan

Foreword by

Paul A. Samuelson

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John Y. Campbell: Affiliation:
Professor of Applied Economics, Harvard University
Michael Szenberg: Affiliation:
Pace University, New York
Lall Ramrattan: Affiliation:
University of California, Berkeley

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Summary

INTRODUCTION

The trade off of risk and return is becoming ever more important for individuals, institutions, and public policy. In fact, Bernstein (1996) suggests that the rational analysis of risk is a defining characteristic of the modern age.

This essay explores risk and return in aggregate stock market investment. It is based on several earlier expositional and research pieces, notably Campbell (1999, 2000, 2003), Campbell and Cochrane (1999), Campbell and Shiller (2001), and Campbell and Viceira (2002).

The comparison of the stock market with the money market is startling. For example, if we look at log real returns on U.S. stocks and Treasury bills over the period 1947.2–1998.4, we find, first, that the average stock return is 8.1 percent, while the average bill return is 0.9 percent; and second, that the volatility of the stock return is 15.6 percent, while the volatility of the ex post real bill return is only 1.8 percent.

These facts lead to two puzzles of asset pricing. The first was christened the equity premium puzzle by Mehra and Prescott (1985): Why is the average real stock return so high (in relation to the average short-term real interest rate)? The second might be called the equity volatility puzzle: Why is the volatility of stock returns so high (in relation to the volatility of the short-term real interest rate)? The classic reference to this second puzzle is Shiller (1981).

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Type: Chapter
Information: New Frontiers in Economics , pp. 128 - 170

DOI: https://doi.org/10.1017/CBO9780511754357.007 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2004

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