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Efficient Nash Equilibrium under Adverse Selection

  • Diasakos, Theodoros M
  • Koufopoulos, Kostas

This paper revisits the problem of adverse selection in the insurance market of Rothschild and Stiglitz [28]. We propose a simple extension of the game-theoretic structure in Hellwig [14] under which Nash-type strategic interaction between the informed customers and the uninformed firms results always in a particular separating equilibrium. The equilibrium allocation is unique and Pareto-efficient in the interim sense subject to incentive-compatibility and individual rationality. In fact, it is the unique neutral optimum in the sense of Myerson [22].

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File URL: http://repo.sire.ac.uk/handle/10943/509
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Paper provided by Scottish Institute for Research in Economics (SIRE) in its series SIRE Discussion Papers with number 2013-92.

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Date of creation: 2013
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Handle: RePEc:edn:sirdps:509
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  1. Pierre Picard, 2014. "Participating Insurance Contracts and the Rothschild-Stiglitz Equilibrium Puzzle," The Geneva Risk and Insurance Review, Palgrave Macmillan, vol. 39(2), pages 153-175, September.
  2. Pradeep Dubey & John Geanakoplos, 2002. "Competitive Pooling: Rothschild-Stiglitz Reconsidered," The Quarterly Journal of Economics, MIT Press, vol. 117(4), pages 1529-1570, November.
  3. Hajime Miyazaki, 1977. "The Rat Race and Internal Labor Markets," Bell Journal of Economics, The RAND Corporation, vol. 8(2), pages 394-418, Autumn.
  4. Prescott, Edward C & Townsend, Robert M, 1984. "Pareto Optima and Competitive Equilibria with Adverse Selection and Moral Hazard," Econometrica, Econometric Society, vol. 52(1), pages 21-45, January.
  5. Veronica Guerrieri & Robert Shimer & Randall Wright, 2009. "Adverse Selection in Competitive Search Equilibrium," NBER Working Papers 14915, National Bureau of Economic Research, Inc.
  6. Alberto Martin, 2003. "On Rothschild-Stiglitz as competitive pooling," Economics Working Papers 917, Department of Economics and Business, Universitat Pompeu Fabra, revised Jan 2006.
  7. Nick Netzer & Florian Scheuer, 2012. "A Game Theoretic Foundation of Competitive Equilibria with Adverse Selection," NBER Working Papers 18471, National Bureau of Economic Research, Inc.
  8. von Siemens, Ferdinand & Kosfeld, Michael, 2009. "Negative Externalities and Equilibrium Existence in Competitive Markets with Adverse Selection," IZA Discussion Papers 4125, Institute for the Study of Labor (IZA).
  9. repec:cup:cbooks:9780521585293 is not listed on IDEAS
  10. Engers, Maxim & Fernandez, Luis F, 1987. "Market Equilibrium with Hidden Knowledge and Self-selection," Econometrica, Econometric Society, vol. 55(2), pages 425-39, March.
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