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The U.S. Equity Return Premium: Past, Present and Future

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  • DeLong, J. Bradford
  • Magin, Konstantin

Abstract

(Introduction, initial paragraphs) For more than a century, diversified longhorizon investors in America’s stock market have invariably received much higher returns than investors in bonds: a return gap averaging some six percent per year that Rajnish Mehra and Edward Prescott (1985) labeled the “equity premium puzzle.” The existence of this equity return premium has been known for generations: more than eighty years ago financial analyst Edgar L. Smith(1924) publicized the fact that longhorizon investors in diversified equities got a very good deal relative to investors in debt: consistently higher longrun average returns with less risk. It was true, Smith wrote three generations ago, that each individual company’s stock was very risky: “subject to the temporary hazard of hard times, and [to the hazard of] a radical change in the arts or of poor corporate management.” But these risks could be managed via diversification across stocks: “effectively eliminated through the application of the same principles which make the writing of fire and life insurance policies profitable.” Edgar L. Smith was right. Common stocks have consistently been extremely attractive as longterm investments. Over the half century before Smith wrote, the Cowles Commission index of American 3 stock prices deflated by consumer prices shows an average real return on equities of 6.5 percent per year— compared to an average real longterm government bond return of 3.6 percent and an average real bill return of 4.5 percent. 1 Since the start of the twentieth century, the Cowles Commission index linked to the Standard and Poor’s Composite shows an average real equity return of 6.0 percent per year, compared to a real bill return of 1.6 percent per year and a real longterm government bond return of 1.8 percent per year. Since World War II equity returns have averaged 6.9 percent per year, bill returns 1.4 percent per year, and bond returns 1.1 percent per year. Similar gaps between stock and bond and bill returns have typically existed in other economies. Mehra (2003) 2 reports an annual equity return premium of 4.6 percent in postWorld War II Britain, 3.3 percent in Japan since 1970, and 6.6 percent and 6.3 percent respectively in Germany and Britain since the mid1970s.

Suggested Citation

  • DeLong, J. Bradford & Magin, Konstantin, 2008. "The U.S. Equity Return Premium: Past, Present and Future," Department of Economics, Working Paper Series qt2827m1qc, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
  • Handle: RePEc:cdl:econwp:qt2827m1qc
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    References listed on IDEAS

    as
    1. Mehra, Rajnish & Prescott, Edward C., 1985. "The equity premium: A puzzle," Journal of Monetary Economics, Elsevier, vol. 15(2), pages 145-161, March.
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