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Political Intergenerational Risk Sharing

  • Marcello D’Amato
  • Vincenzo Galasso

In a stochastic two-period OLG model, featuring an aggregate shock to the economy, ex-ante optimality requires intergenerational risk sharing. We compare the level of time-consistent intergenerational risk sharing chosen by a social planner and by office seeking politicians. In the political setting, the transfer of resources across generations — a PAYG pension system — is determined as a Markov equilibrium of a probabilistic voting game. Negative shocks represented by low realized returns on the risky asset induce politicians to compensate the old through a PAYG system. Unless the young are crucial to win the election, this political system generates more intergenerational risk sharing than the (time consistent) social optimum. In particular, these transfers are more persistent and less responsive to the realization of the shock than optimal. This is because politicians anticipate their current transfers to the elderly to be compensated through offsetting transfers by future politicians, and thus have an incentive to overspend. Perhaps surprisingly, aging increases the socially optimal transfer but makes politicians less likely to overspend, by making it more costly for future politicians to compensate the current young.

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Paper provided by IGIER (Innocenzo Gasparini Institute for Economic Research), Bocconi University in its series Working Papers with number 342.

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Date of creation: 2008
Date of revision:
Handle: RePEc:igi:igierp:342
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  1. Razin, Assaf & Sadka, Efraim & Swagel, Phill, 2001. "The Aging Population and the Size of the Welfare State," CEPR Discussion Papers 2930, C.E.P.R. Discussion Papers.
  2. Georges Casamatta & Helmuth Cremer & Pierre Pestieau, 2000. "The Political Economy of Social Security," CESifo Working Paper Series 259, CESifo Group Munich.
  3. Perotti, Enrico & Schwienbacher, Armin, 2009. "The political origin of pension funding," Journal of Financial Intermediation, Elsevier, vol. 18(3), pages 384-404, July.
  4. repec:fda:fdaddt:2003-03 is not listed on IDEAS
  5. Disney, Richard, 2007. "Population ageing and the size of the welfare state: Is there a puzzle to explain?," European Journal of Political Economy, Elsevier, vol. 23(2), pages 542-553, June.
  6. Shiller, Robert J., 1999. "Social security and institutions for intergenerational, intragenerational, and international risk-sharing," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 50(1), pages 165-204, June.
  7. Stephen Morris & Stephen Coate, 1999. "Policy Persistence," American Economic Review, American Economic Association, vol. 89(5), pages 1327-1336, December.
  8. Felix Kubler & Department of Economics & Department of Economics & Piero Gottardi, 2007. "Social Security and RIsk Sharing," 2007 Meeting Papers 625, Society for Economic Dynamics.
  9. Marina Azzimonti Renzo, 2004. "On the dynamic inefficiency of governments," 2004 Meeting Papers 228, Society for Economic Dynamics.
  10. Simonovits, Andras, 2007. "Can population ageing imply a smaller welfare state?," European Journal of Political Economy, Elsevier, vol. 23(2), pages 534-541, June.
  11. J. Ignacio Conde-Ruiz & Paola Profeta, 2007. "The Redistributive Design of Social Security Systems," Economic Journal, Royal Economic Society, vol. 117(520), pages 686-712, 04.
  12. Gonzalez-Eiras, Marti­n & Niepelt, Dirk, 2008. "The future of social security," Journal of Monetary Economics, Elsevier, vol. 55(2), pages 197-218, March.
  13. Hassler, John & Mora, José V Rodríguez & Storesletten, Kjetil & Zilibotti, Fabrizio, 2001. "The Survival of the Welfare State," CEPR Discussion Papers 2905, C.E.P.R. Discussion Papers.
  14. Conde-Ruiz, J. Ignacio & Galasso, Vincenzo, 2004. "The macroeconomics of early retirement," Journal of Public Economics, Elsevier, vol. 88(9-10), pages 1849-1869, August.
  15. 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.
  16. Kjetil Storesletten & Chris Telmer & Amir Yaron, 1998. "The risk sharing implications of alternative social security arrangements," GSIA Working Papers 252, Carnegie Mellon University, Tepper School of Business.
  17. Grossman, Gene & Helpman, Elhanan, 1996. "Intergenerational Redistribution with Short-lived Governments," CEPR Discussion Papers 1396, C.E.P.R. Discussion Papers.
  18. Jonathan Gruber & David A. Wise, 1999. "Social Security and Retirement around the World," NBER Books, National Bureau of Economic Research, Inc, number grub99-1, December.
  19. Conde-Ruiz, José Ignacio & Galasso, Vincenzo, 2000. "Early Retirement," CEPR Discussion Papers 2589, C.E.P.R. Discussion Papers.
  20. Conny Olovsson, 2005. "The Welfare Gains of Improving Risk Sharing in Social Security," 2005 Meeting Papers 584, Society for Economic Dynamics.
  21. Antonio Rangel & Richard Zeckhauser, 1999. "Can Market and Voting Institutions Generate Optimal Intergenerational Risk Sharing?," NBER Working Papers 6949, National Bureau of Economic Research, Inc.
  22. Roger H. Gordon & Hal R. Varian, 1985. "Intergenerational Risk Sharing," NBER Working Papers 1730, National Bureau of Economic Research, Inc.
  23. Robert C. Merton, 1983. "On the Role of Social Security as a Means for Efficient Risk Sharing in an Economy Where Human Capital Is Not Tradable," NBER Chapters, in: Financial Aspects of the United States Pension System, pages 325-358 National Bureau of Economic Research, Inc.
  24. Song, Zheng, 2008. "Persistent Ideology and the Determination of Public Policies over Time," MPRA Paper 10364, University Library of Munich, Germany.
  25. Marco Battaglini & Stephen Coate, 2008. "A Dynamic Theory of Public Spending, Taxation, and Debt," American Economic Review, American Economic Association, vol. 98(1), pages 201-36, March.
  26. Enders, Walter & Lapan, Harvey E, 1982. "Social Security Taxation and Intergenerational Risk Sharing," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 23(3), pages 647-58, October.
  27. Zvi Bodie & John B. Shoven, 1983. "Financial Aspects of the United States Pension System," NBER Books, National Bureau of Economic Research, Inc, number bodi83-1, December.
  28. Hassler, John & Storesletten, Kjetil & Zilibotti, Fabrizio, 2007. "Democratic public good provision," Journal of Economic Theory, Elsevier, vol. 133(1), pages 127-151, March.
  29. Krueger, Dirk & Kubler, Felix, 2005. "Pareto improving social security reform when financial markets are incomplete!?," CFS Working Paper Series 2005/12, Center for Financial Studies (CFS).
  30. Matsen, Egil & Thogersen, Oystein, 2004. "Designing social security - a portfolio choice approach," European Economic Review, Elsevier, vol. 48(4), pages 883-904, August.
  31. Bohn, Henning, 2009. "Intergenerational risk sharing and fiscal policy," Journal of Monetary Economics, Elsevier, vol. 56(6), pages 805-816, September.
  32. Franklin Allen & Douglas Gale, 1996. "Financial Markets, Intermediaries and Intertemporal Smoothing," Center for Financial Institutions Working Papers 96-33, Wharton School Center for Financial Institutions, University of Pennsylvania.
  33. Andrzej Nowak, 2006. "On perfect equilibria in stochastic models of growth with intergenerational altruism," Economic Theory, Springer, vol. 28(1), pages 73-83, 05.
  34. Vincenzo Galasso, 2006. "The Political Future of Social Security in Aging Societies," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262072734, June.
  35. Courtney Coile & Jonathan Gruber, 2000. "Social Security and Retirement," NBER Working Papers 7830, National Bureau of Economic Research, Inc.
  36. Gabrielle Demange, 2002. "On optimality in intergenerational risk sharing," Economic Theory, Springer, vol. 20(1), pages 1-27.
  37. Gabrielle Demange, 2009. "On Sustainable Pay-as-You-Go Contribution Rules," Journal of Public Economic Theory, Association for Public Economic Theory, vol. 11(4), pages 493-527, 08.
  38. D'Amato, Marcello & Galasso, Vincenzo, 2002. "Aggregate Risk, Political Constraints and Social Security Design," CEPR Discussion Papers 3330, C.E.P.R. Discussion Papers.
  39. Zheng Song, 2012. "Persistent Ideology And The Determination Of Public Policy Over Time," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 53(1), pages 175-202, 02.
  40. Galasso, Vincenzo & Profeta, Paola, 2007. "How does ageing affect the welfare state?," European Journal of Political Economy, Elsevier, vol. 23(2), pages 554-563, June.
  41. Georges de Menil & Eytan Sheshinski, 2004. "Planning for the Optimal Mix of Paygo Tax and Funded Savings," DELTA Working Papers 2004-15, DELTA (Ecole normale supérieure).
  42. Paul Klein & Per Krusell & José-V�ctor R�os-Rull, 2008. "Time-Consistent Public Policy," Review of Economic Studies, Oxford University Press, vol. 75(3), pages 789-808.
  43. Bohn, Henning, 1998. "Risk Sharing in a Stochastic Overlapping Generations Economy," University of California at Santa Barbara, Economics Working Paper Series qt9r2809f0, Department of Economics, UC Santa Barbara.
  44. 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.
  45. Bernheim, B. Douglas & Ray, Debraj, 1989. "Markov perfect equilibria in altruistic growth economies with production uncertainty," Journal of Economic Theory, Elsevier, vol. 47(1), pages 195-202, February.
  46. Michele Boldrin & Juan J. Dolado & Juan F. Jimeno & Franco Peracchi, 1999. "The future of pensions in Europe," Economic Policy, CEPR;CES;MSH, vol. 14(29), pages 287-320, October.
  47. Bossi, Luca, 2008. "Intergenerational risk shifting through social security and bailout politics," Journal of Economic Dynamics and Control, Elsevier, vol. 32(7), pages 2240-2268, July.
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