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Dynamic Suboptimality of Competitive Equilibrium in Multiperiod Overlapping Generations Economies

  • Espen Henriksen

    ()

    (University of Oslo)

  • Steve Spear

    (Carnegie Mellon)

The question we ask is: within the set of a three-period-lived OLG economies with a stochastic endowment process, a stochastic dividend process, and sequentially complete markets, under what set of conditions may a set of government transfers dynamically Pareto dominate the laissez faire equilibrium? We start by characterizing perfect risk sharing and find that it implies a strongly stationary set of state-dependent consumption claims. We also derive the stochastic equivalent of the deterministic steady-state by steady-state optimal marginal rate of substitution. We show then that the risk sharing of the recursive competitive laissez faire equilibrium of any overlapping generations economy with weakly more than three generations is nonstationary and that risk is suboptimally shared. We then show that we can construct a sequence of consumption allocations that only depends on the exogenous state and which Pareto dominate the laissez faire allocations in an ex interim as well as ex ante sense. We also redefine conditional Pareto optimality to apply within this framework and show that under a broad set of conditions, there also exists a sequence of allocations that dominates the laissez faire equilibrium in this sense. Finally, we apply these tools and results to an economy where the endowment is constant, but where fertility is stochastic, i.e. the number of newborn individuals who enters the economy follows a Markov Process

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Paper provided by Society for Computational Economics in its series Computing in Economics and Finance 2006 with number 223.

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Date of creation: 04 Jul 2006
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Handle: RePEc:sce:scecfa:223
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  1. Dirk Krueger & Felix Kubler, 2002. "Intergenerational Risk-Sharing via Social Security when Financial Markets Are Incomplete," American Economic Review, American Economic Association, vol. 92(2), pages 407-410, May.
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  8. John Geanakoplos & Michael Magill & Martine Quinzii, 2002. "Demography and the Long-run Predictability of the Stock Market," Cowles Foundation Discussion Papers 1380R, Cowles Foundation for Research in Economics, Yale University, revised Jul 2004.
  9. Laurence Ball & N. Gregory Mankiw, 2007. "Intergenerational Risk Sharing in the Spirit of Arrow, Debreu, and Rawls, with Applications to Social Security Design," Journal of Political Economy, University of Chicago Press, vol. 115(4), pages 523-547, 08.
  10. Kent A. Smetters, 2004. "Trading with the Unborn: A New Perspective on Capital Income Taxation," Working Papers wp066, University of Michigan, Michigan Retirement Research Center.
  11. Rao Aiyagari, S. & Peled, Dan, 1991. "Dominant root characterization of Pareto optimality and the existence of optimal equilibria in stochastic overlapping generations models," Journal of Economic Theory, Elsevier, vol. 54(1), pages 69-83, June.
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  13. Bohn, Henning, 2009. "Intergenerational risk sharing and fiscal policy," Journal of Monetary Economics, Elsevier, vol. 56(6), pages 805-816, September.
  14. Spear, Stephen E., 1985. "Rational expectations in the overlapping generations model," Journal of Economic Theory, Elsevier, vol. 35(2), pages 251-275, August.
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