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Dynamic Suboptimality of Competitive Equilibrium in Multiperiod Overlapping Generations Economies

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  • Espen Henriksen

    ()
    (University of Oslo)

  • Steve Spear

    (Carnegie Mellon)

Abstract

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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Bibliographic Info

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. Laurence Ball & N Gregory Mankiw, 2001. "Intergenerational Risk Sharing in the Spirit of Arrow Debreu and Rawls with Applications to Social Security Design," Economics Working Paper Archive 478, The Johns Hopkins University,Department of Economics.
  2. Zilcha, Itzhak, 1990. "Dynamic efficiency in overlapping generations models with stochastic production," Journal of Economic Theory, Elsevier, vol. 52(2), pages 364-379, December.
  3. Henning Bohn, 2004. "Intergenerational Risk Sharing and Fiscal Policy," 2004 Meeting Papers 22, Society for Economic Dynamics.
  4. 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.
  5. Peled, Dan, 1982. "Informational diversity over time and the optimality of monetary equilibria," Journal of Economic Theory, Elsevier, vol. 28(2), pages 255-274, December.
  6. Kent A. Smetters, 2003. "Trading with the Unborn: A New Perspective on Capital Income Taxation," NBER Working Papers 9412, National Bureau of Economic Research, Inc.
  7. Andrew Abel & Gregory N. Mankiw & Lawrence H. Summers & Richard Zeckhauser, . "Assessing Dynamic Efficiency: Theory and Evidence," Rodney L. White Center for Financial Research Working Papers 14-88, Wharton School Rodney L. White Center for Financial Research.
  8. Chattopadhyay, Subir & Gottardi, Piero, 1999. "Stochastic OLG Models, Market Structure, and Optimality," Journal of Economic Theory, Elsevier, vol. 89(1), pages 21-67, November.
  9. 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.
  10. Gale, David, 1973. "Pure exchange equilibrium of dynamic economic models," Journal of Economic Theory, Elsevier, vol. 6(1), pages 12-36, February.
  11. Monderer, Dov & Shapley, Lloyd S., 1996. "Potential Games," Games and Economic Behavior, Elsevier, vol. 14(1), pages 124-143, May.
  12. Spear, Stephen E., 1985. "Rational expectations in the overlapping generations model," Journal of Economic Theory, Elsevier, vol. 35(2), pages 251-275, August.
  13. 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.
  14. Muench, Thomas J., 1977. "Optimality, the interaction of spot and futures markets, and the nonneutrality of money in the lucas model," Journal of Economic Theory, Elsevier, vol. 15(2), pages 325-344, August.
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Cited by:
  1. Gaetano Bloise & Filippo L. Calciano, 2007. "A Note On The Characterization Of Inefficiency In Stochastic Overlapping Generations Economies," Departmental Working Papers of Economics - University 'Roma Tre' 0083, Department of Economics - University Roma Tre.

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