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Nonexclusive Competition in the Market for Lemons

  • Andrea Attar
  • Thomas Mariotti
  • François Salanié

We consider an exchange economy in which a seller can trade an endowment of a divisible good whose quality she privately knows. Buyers compete in menus of non-exclusive contracts, so that the seller may choose to trade with several buyers. In this context, we show that an equilibrium always exists and that aggregate equilibrium allocations are generically unique. Although the good offered by the seller is divisible, aggregate equilibrium allocations exhibit no fractional trades. In equilibrium, goods of relatively low quality are traded at the same price, while goods of higher quality may end up not being traded at all if the adverse selection problem is severe. This provides a novel strategic foundation for Akerlof's (1970) results, which contrasts with standard competitive screening models postulating enforceability of exclusive contracts. Latent contracts that are issued but not traded in equilibrium turn out to be an essential feature of our construction.

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Article provided by Econometric Society in its journal Econometrica.

Volume (Year): 79 (2011)
Issue (Month): 6 (November)
Pages: 1869-1918

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Handle: RePEc:ecm:emetrp:v:79:y:2011:i:6:p:1869-1918
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  1. Bizer, David S & DeMarzo, Peter M, 1992. "Sequential Banking," Journal of Political Economy, University of Chicago Press, vol. 100(1), pages 41-61, February.
  2. Giacomo Calzolari, 2004. "Incentive Regulation of Multinational Enterprises," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 45(1), pages 257-282, 02.
  3. Ilya Segal & Michael D. Whinston, 2003. "Robust Predictions for Bilateral Contracting with Externalities," Econometrica, Econometric Society, vol. 71(3), pages 757-791, 05.
  4. Jean-Jacques Laffont & Jérome Pouyet, 2000. "The Subsidiarity Bias in Regulation," SERIES 0001, Dipartimento di Scienze economiche e metodi matematici - Università di Bari, revised Jun 2000.
  5. Piaser, Gwenaël, 2007. "Direct Mechanisms, Menus and Latent Contracts," MPRA Paper 7049, University Library of Munich, Germany.
  6. Amy Finkelstein & James Poterba, 2004. "Adverse Selection in Insurance Markets: Policyholder Evidence from the U.K. Annuity Market," Journal of Political Economy, University of Chicago Press, vol. 112(1), pages 183-208, February.
  7. Attar, Andrea & Chassagnon, Arnold, 2009. "On moral hazard and nonexclusive contracts," Journal of Mathematical Economics, Elsevier, vol. 45(9-10), pages 511-525, September.
  8. Yaari, Menahem E, 1987. "The Dual Theory of Choice under Risk," Econometrica, Econometric Society, vol. 55(1), pages 95-115, January.
  9. Charles M. Kahn & Dilip Mookherjee, 1996. "Competition and Incentives with Non-Exclusive Contracts," Papers 0075, Boston University - Industry Studies Programme.
  10. Mas-Colell, Andreu & Whinston, Michael D. & Green, Jerry R., 1995. "Microeconomic Theory," OUP Catalogue, Oxford University Press, number 9780195102680, December.
  11. Biais, Bruno & Martimort, David & Rochet, Jean-Charles, 1998. "Competing Mechanisms in a Commun Value Environment," IDEI Working Papers 75, Institut d'Économie Industrielle (IDEI), Toulouse.
  12. Peters, Michael, 2001. "Common Agency and the Revelation Principle," Econometrica, Econometric Society, vol. 69(5), pages 1349-72, September.
  13. Bisin, Alberto & Gottardi, Piero, 1999. "Competitive Equilibria with Asymmetric Information," Journal of Economic Theory, Elsevier, vol. 87(1), pages 1-48, July.
  14. Martimort, David, 1992. "Multi-Principaux avec Anti-Sélection," IDEI Working Papers 14, Institut d'Économie Industrielle (IDEI), Toulouse.
  15. Alberto Bisin & Danilo Guaitoli, 2004. "Moral Hazard and Nonexclusive Contracts," RAND Journal of Economics, The RAND Corporation, vol. 35(2), pages 306-328, Summer.
  16. B. Douglas Bernheim & Michael D. Whinston, 1986. "Menu Auctions, Resource Allocation, and Economic Influence," The Quarterly Journal of Economics, Oxford University Press, vol. 101(1), pages 1-31.
  17. Biais, Bruno & Mariotti, Thomas, 2003. "Strategic Liquidity Supply and Security Design," IDEI Working Papers 160, Institut d'Économie Industrielle (IDEI), Toulouse, revised Mar 2004.
  18. Martimort David & Stole Lars, 2003. "Contractual Externalities and Common Agency Equilibria," The B.E. Journal of Theoretical Economics, De Gruyter, vol. 3(1), pages 1-40, July.
  19. Gwenaël Piaser, 2007. "Direct Mechanisms, Menus and Latent Contracts," LSF Research Working Paper Series 07-09, Luxembourg School of Finance, University of Luxembourg.
  20. Jaynes, Gerald David, 1978. "Equilibria in monopolistically competitive insurance markets," Journal of Economic Theory, Elsevier, vol. 19(2), pages 394-422, December.
  21. Bisin, A. & Gottardi, P., 1999. "Competitive Equilibria with Asymmetric Information: Existence with Entry Fees," Working Papers 99-03, C.V. Starr Center for Applied Economics, New York University.
  22. Rochet, J. C., 1985. "The taxation principle and multi-time Hamilton-Jacobi equations," Journal of Mathematical Economics, Elsevier, vol. 14(2), pages 113-128, April.
  23. Gwena�l Piaser, 2006. "The Biais-Martimort-Rochet equilibrium with direct mechanisms," Working Papers 2006_33, Department of Economics, University of Venice "Ca' Foscari".
  24. Pierre‐André Chiappori & Bruno Jullien & Bernard Salanié & François Salanié, 2006. "Asymmetric information in insurance: general testable implications," RAND Journal of Economics, RAND Corporation, vol. 37(4), pages 783-798, December.
  25. repec:adr:anecst:y:1992:i:28:p:01 is not listed on IDEAS
  26. Samuelson, William F, 1984. "Bargaining under Asymmetric Information," Econometrica, Econometric Society, vol. 52(4), pages 995-1005, July.
  27. Peter DeMarzo & Darrell Duffie, 1999. "A Liquidity-Based Model of Security Design," Econometrica, Econometric Society, vol. 67(1), pages 65-100, January.
  28. Bernheim, B Douglas & Whinston, Michael D, 1986. "Common Agency," Econometrica, Econometric Society, vol. 54(4), pages 923-42, July.
  29. John Cawley & Tomas Philipson, 1997. "An Empirical Examination of Information Barriers to Trade inInsurance," University of Chicago - George G. Stigler Center for Study of Economy and State 132, Chicago - Center for Study of Economy and State.
  30. George A. Akerlof, 1970. "The Market for "Lemons": Quality Uncertainty and the Market Mechanism," The Quarterly Journal of Economics, Oxford University Press, vol. 84(3), pages 488-500.
  31. Hellwig, Martin F., 1988. "A note on the specification of interfirm communication in insurance markets with adverse selection," Journal of Economic Theory, Elsevier, vol. 46(1), pages 154-163, October.
  32. 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.
  33. John G. Riley, 2001. "Silver Signals: Twenty-Five Years of Screening and Signaling," Journal of Economic Literature, American Economic Association, vol. 39(2), pages 432-478, June.
  34. David Martimort & Lars Stole, 2009. "Market participation in delegated and intrinsic common-agency games," RAND Journal of Economics, RAND Corporation, vol. 40(1), pages 78-102.
  35. Marc Rysman, 2006. "An Empirical Analysis of Payment Card Usage," Boston University - Department of Economics - Working Papers Series WP2006-002, Boston University - Department of Economics.
  36. David Martimort & Lars Stole, 2002. "The Revelation and Delegation Principles in Common Agency Games," Econometrica, Econometric Society, vol. 70(4), pages 1659-1673, July.
  37. Mark V. Pauly, 1974. "Overinsurance and Public Provision of Insurance: The Roles of Moral Hazard and Adverse Selection," The Quarterly Journal of Economics, Oxford University Press, vol. 88(1), pages 44-62.
  38. Enrica Detragiache & Paolo Garella & Luigi Guiso, 2000. "Multiple versus Single Banking Relationships: Theory and Evidence," Journal of Finance, American Finance Association, vol. 55(3), pages 1133-1161, 06.
  39. Riley, John G, 1985. "Competition with Hidden Knowledge," Journal of Political Economy, University of Chicago Press, vol. 93(5), pages 958-76, October.
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