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Intergenerational risksharing and equilibrium asset prices

  • Campbell, John Y.
  • Nosbusch, Yves

In the presence of overlapping generations, markets are incomplete because it is impossible to engage in risksharing trades with the unborn. In such an environment the government can use a social security system, with contingent taxes and benefits, to improve risksharing across generations. An interesting question is how the form of the social security system affects asset prices in equilibrium. In this paper we set up a simple model with two risky factors of production: human capital, owned by the young, and physical capital, owned by all older generations. We show that a social security system that optimally shares risks across generations exposes future generations to a share of the risk in physical capital returns. Such a system reduces precautionary saving and increases the risk-bearing capacity of the economy. Under plausible conditions it increases the riskless interest rate, lowers the price of physical capital, and reduces the risk premium on physical capital.

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Article provided by Elsevier in its journal Journal of Monetary Economics.

Volume (Year): 54 (2007)
Issue (Month): 8 (November)
Pages: 2251-2268

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Handle: RePEc:eee:moneco:v:54:y:2007:i:8:p:2251-2268
Contact details of provider: Web page: http://www.elsevier.com/locate/inca/505566

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  8. Henning Bohn, 2001. "Retirement Savings in an Aging Society: A Case for Innovative Government Debt Management," CESifo Working Paper Series 494, CESifo Group Munich.
  9. Luca Benzoni & Pierre Collin-Dufresne & Robert S. Goldstein, 2005. "Portfolio Choice over the Life-Cycle in the Presence of 'Trickle Down' Labor Income," NBER Working Papers 11247, National Bureau of Economic Research, Inc.
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  18. Luis M. Viceira, 1999. "Optimal Portfolio Choice for Long-Horizon Investors with Nontradable Labor Income," NBER Working Papers 7409, National Bureau of Economic Research, Inc.
  19. George M. Constantinides & John B. Donaldson & Rajnish Mehra, 2002. "Junior Must Pay: Pricing the Implicit Put in Privatizing Social Security," NBER Working Papers 8906, National Bureau of Economic Research, Inc.
  20. John Y. Campbell & João F. Cocco & Francisco J. Gomes & Pascal J. Maenhout, 2001. "Investing Retirement Wealth: A Life-Cycle Model," NBER Chapters, in: Risk Aspects of Investment-Based Social Security Reform, pages 439-482 National Bureau of Economic Research, Inc.
  21. John McHale, 2001. "The Risk of Social Security Benefit-Rule Changes: Some International Evidence," NBER Chapters, in: Risk Aspects of Investment-Based Social Security Reform, pages 247-290 National Bureau of Economic Research, Inc.
  22. Paul A. Samuelson, 1958. "An Exact Consumption-Loan Model of Interest with or without the Social Contrivance of Money," Journal of Political Economy, University of Chicago Press, vol. 66, pages 467.
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