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Efficient Competitive Equilibria with Adverse Selection

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Author Info
Alberto Bisin ()
Piero Gottardi ()

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Abstract

Do Walrasian markets function orderly in the presence of adverse selection? In particular, is their outcome efficient? This paper addresses these questions in the context of a Rothschild and Stiglitz insurance economy. We identify an externality associated with the presence of adverse selection as a special form of consumption externality. Consequently, we show that while competitive equilibria always exist, they are not typically incentive efficient. However, as markets for pollution rights can internalize environmental externalities, markets for consumption rights can be designed so as to internalize the consumption externality due to adverse selection. With such markets competitive equilibria exist and are always incentive efficient. Moreover, any incentive efficient allocation can be decentralized as a competitive equilibrium.

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Paper provided by CESifo Group Munich in its series CESifo Working Paper Series with number CESifo Working Paper No. 1504.

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Date of creation: 2005
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Handle: RePEc:ces:ceswps:_1504

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Find related papers by JEL classification:
D50 - Microeconomics - - General Equilibrium and Disequilibrium - - - General
D62 - Microeconomics - - Welfare Economics - - - Externalities
D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information
G22 - Financial Economics - - Financial Institutions and Services - - - Insurance; Insurance Companies

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Ledyard, John O. & Szakaly-Moore, Kristin, 1994. "Designing organizations for trading pollution rights," Journal of Economic Behavior & Organization, Elsevier, vol. 25(2), pages 167-196, October. [Downloadable!] (restricted)
  2. Alberto Bennardo & Pierre-Andre Chiappori, 2003. "Bertrand and Walras Equilibria Under Moral Hazard," Levine's Working Paper Archive 618897000000000748, David K. Levine. [Downloadable!]
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  3. Bisin, Alberto & Gottardi, Piero, 1999. "Competitive Equilibria with Asymmetric Information," Journal of Economic Theory, Elsevier, vol. 87(1), pages 1-48, July. [Downloadable!] (restricted)
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  4. Cole, Harold Linh, 1989. "General Competitive Analysis in an Economy with Private Information: Comment," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 30(1), pages 249-52, February. [Downloadable!] (restricted)
  5. V. V. Chari & Larry E. Jones, 1991. "A reconsideration of the problem of social cost: free riders and monopolists," Staff Report 142, Federal Reserve Bank of Minneapolis. [Downloadable!]
  6. Kehoe, Timothy J. & Levine, David K. & Prescott, Edward C., 2002. "Lotteries, Sunspots, and Incentive Constraints," Journal of Economic Theory, Elsevier, vol. 107(1), pages 39-69, November. [Downloadable!] (restricted)
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  7. Pradeep Dubey & John Geanakoplos & Martin Shubik, 1988. "Default and Efficiency in a General Equilibrium Model with Incomplete Markets," Cowles Foundation Discussion Papers 879R, Cowles Foundation, Yale University, revised Feb 1989. [Downloadable!]
  8. Gale, Douglas, 1996. "Equilibria and Pareto Optima of Markets with Adverse Selection," Economic Theory, Springer, vol. 7(2), pages 207-35, February.
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  9. Belen Jerez, 2000. "General Equilibrium with Asymmetric Information: A Dual Approach," Econometric Society World Congress 2000 Contributed Papers 1497, Econometric Society. [Downloadable!]
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  10. Gale, Douglas, 1992. "A Walrasian Theory of Markets with Adverse Selection," Review of Economic Studies, Blackwell Publishing, vol. 59(2), pages 229-55, April. [Downloadable!] (restricted)
  11. John H. Boyd & Edward C. Prescott & Bruce D. Smith, 1988. "Organizations in economic analysis," Working Papers 385, Federal Reserve Bank of Minneapolis.
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  12. Prescott, Edward C & Townsend, Robert M, 1984. "General Competitive Analysis in an Economy with Private Information," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 25(1), pages 1-20, February. [Downloadable!] (restricted)
  13. Hellwig, Martin, 1987. "Some recent developments in the theory of competition in markets with adverse selection ," European Economic Review, Elsevier, vol. 31(1-2), pages 319-325. [Downloadable!] (restricted)
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  14. Rothschild, Michael & Stiglitz, Joseph E, 1976. "Equilibrium in Competitive Insurance Markets: An Essay on the Economics of Imperfect Information," The Quarterly Journal of Economics, MIT Press, vol. 90(4), pages 630-49, November.
  15. Crocker, Keith J. & Snow, Arthur, 1985. "The efficiency of competitive equilibria in insurance markets with asymmetric information," Journal of Public Economics, Elsevier, vol. 26(2), pages 207-219, March. [Downloadable!] (restricted)
  16. Riley, John G, 1979. "Informational Equilibrium," Econometrica, Econometric Society, vol. 47(2), pages 331-59, March. [Downloadable!] (restricted)
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  17. Alberto Bisin & Piero Gottardi, 2006. "Efficient Competitive Equilibria with Adverse Selection," Journal of Political Economy, University of Chicago Press, vol. 114(3), pages 485-516, June. [Downloadable!] (restricted)
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  18. Maskin, Eric & Tirole, Jean, 1992. "The Principal-Agent Relationship with an Informed Principal, II: Common Values," Econometrica, Econometric Society, vol. 60(1), pages 1-42, January. [Downloadable!] (restricted)
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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Hervé Crès & Mich Tvede, 2005. "On the Political Economy of Adverse Selection," Discussion Papers 05-14, University of Copenhagen. Department of Economics, revised Jun 2006. [Downloadable!]
  2. Joao Correia-da-Silva, 2009. "Uncertain delivery in markets for lemons," FEP Working Papers 310, Universidade do Porto, Faculdade de Economia do Porto. [Downloadable!]
    Other versions:
  3. Aldo Rustichini & Paolo Siconolfi, 2008. "General equilibrium in economies with adverse selection," Economic Theory, Springer, vol. 37(1), pages 1-29, October. [Downloadable!] (restricted)
  4. Piero Gottardi & Alberto Bisin & Adriano Rampini, 2007. "Managerial Hedging and Portfolio Monitoring," Working Papers 2007_24, University of Venice "Ca' Foscari", Department of Economics. [Downloadable!]
    Other versions:
  5. Alberto Bennardo & Salvatore Piccolo, 2005. "Competitive Markets with Endogenous Health Risks," CSEF Working Papers 145, Centre for Studies in Economics and Finance (CSEF), University of Naples, Italy. [Downloadable!]
    Other versions:
  6. Jérome Pouyet & Bernard Salanié & Francois Salanié, 2008. "On Competitive Equilibria with Asymmetric Information," Topics in Theoretical Economics, Berkeley Electronic Press, vol. 8(1), pages 1385-1385. [Downloadable!] (restricted)
  7. Alberto Bisin & Piero Gottardi, 2003. "Competitive Markets for Non-Exclusive Contracts with Adverse Selection: the Role of Entry Fees," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 6(2), pages 313-338, April. [Downloadable!] (restricted)
  8. Alberto Bisin & Piero Gottardi, 2005. "Efficient Competitive Equilibria with Adverse Selection," CESifo Working Paper Series CESifo Working Paper No. , CESifo Group Munich. [Downloadable!]
    Other versions:
  9. George J. Mailath & Georg Noldeke, 2006. "Extreme Adverse Selection, Competitive Pricing, and Market Breakdown," Cowles Foundation Discussion Papers 1573, Cowles Foundation, Yale University. [Downloadable!]
    Other versions:
  10. Alberto Martin, 2008. "Adverse Selection, Credit, and Efficiency: the Case of the Missing Market," Economics Working Papers 1085, Department of Economics and Business, Universitat Pompeu Fabra, revised Sep 2009. [Downloadable!]
  11. Arnold Chassagnon & Bertrand Villeneuve, 2002. "Efficient risk-sharing under adverse selection and subjective risk perception," DELTA Working Papers 2002-19, DELTA (Ecole normale supérieure). [Downloadable!]
  12. Thorsten Koeppl, 2004. "Risk Sharing through Financial Markets with Endogenous Enforcement of Trades," Working Papers 1048, Queen's University, Department of Economics. [Downloadable!]
    Other versions:
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