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On the Size Distribution of Macroeconomic Disasters

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  • Robert J. Barro
  • Tao Jin

Abstract

In the rare-disasters setting, a key determinant of the equity premium is the size distribution of macroeconomic disasters, gauged by proportionate declines in per capita consumption or GDP. The long-term national-accounts data for up to 36 countries provide a large sample of disaster events of magnitude 10% or more. For this sample, a power-law density provides a good fit to the distribution of the ratio of normal to disaster consumption or GDP. The key parameter of the size distribution is the upper-tail exponent, α, estimated to be near 5, with a 95% confidence interval between 3-1/2 and 7. The equity premium involves a race between α and the coefficient of relative risk aversion, γ. A higher α signifies a thinner tail and, therefore, a lower equity premium, whereas a higher γ implies a higher equity premium. The equity premium is finite if α 1>γ. To accord with the observed average unlevered equity premium of around 5%, we get a point estimate for γ close to 3, with a 95% confidence interval of roughly 2 to 4.

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Bibliographic Info

Article provided by Econometric Society in its journal Econometrica.

Volume (Year): 79 (2011)
Issue (Month): 5 (09)
Pages: 1567-1589

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Handle: RePEc:ecm:emetrp:v:79:y:2011:i:5:p:1567-1589

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  1. R. Mehra & E. Prescott, 2010. "The equity premium: a puzzle," Levine's Working Paper Archive 1401, David K. Levine.
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  8. Lucas, Robert E, Jr, 1978. "Asset Prices in an Exchange Economy," Econometrica, Econometric Society, vol. 46(6), pages 1429-45, November.
  9. Barro, Robert, 2006. "Rare Disasters and Asset Markets in the Twentieth Century," Scholarly Articles 3208215, Harvard University Department of Economics.
  10. Epstein, Larry G & Zin, Stanley E, 1989. "Substitution, Risk Aversion, and the Temporal Behavior of Consumption and Asset Returns: A Theoretical Framework," Econometrica, Econometric Society, vol. 57(4), pages 937-69, July.
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Cited by:
  1. Kuehn, Lars-Alexander & Petrosky-Nadeau, Nicolas & Zhang, Lu, 2011. "An Equilibrium Asset Pricing Model with Labor Market Search," Working Paper Series 2012-01, Ohio State University, Charles A. Dice Center for Research in Financial Economics.
  2. Robert J. Barro & José F. Ursua, 2011. "Rare Macroeconomic Disasters," NBER Working Papers 17328, National Bureau of Economic Research, Inc.
  3. Adam, Klaus & Grill, Michael, 2012. "Optimal Sovereign Default," CEPR Discussion Papers 9178, C.E.P.R. Discussion Papers.

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