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Equilibrium and Strategic Communication in the Adverse Selection Insurance Model

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  • Jaynes, Gerald D.

    (Yale University)

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    Abstract

    Shows equilibrium always exists (Rothschild-Stiglitz-Wilson model) when firms enforce policy exclusivity via strategic (profit-maximizing) communication of client purchases. Strategic communication induces two equilibrium types: partial communication of purchase information or non-communication which exhibits a lemon effect (low-risk purchase no insurance). Nonetheless, Jaynes' configuration (Jaynes; Beaudry & Poitevin) allocating both risk-types a low-coverage pooling contract and high-risk supplementary expensive coverage always characterizes equilibrium including Perfect Bayesian Equilibrium in Hellwig's two-stage framework where inter-firm informational asymmetries impose additional "competitive" features. Adverse selection induces salient features of financial markets: Bertrand-Edgeworth competition, latent contracts, strategic exclusivity-policy cancellation tactics, market institutions for sharing information.

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    Bibliographic Info

    Paper provided by Yale University, Department of Economics in its series Working Papers with number 91.

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    Date of creation: May 2011
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    Handle: RePEc:ecl:yaleco:91

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    1. Beaudry, P. & Poitevin, M., 1990. "Competitive Screening In Financial Market When Borrowers Can Recontract," Cahiers de recherche 9035, Centre interuniversitaire de recherche en ├ęconomie quantitative, CIREQ.
    2. Alberto Bisin & Danilo Guaitoli, 1998. "Moral hazard and non-exclusive contracts," Economics Working Papers 345, Department of Economics and Business, Universitat Pompeu Fabra.
    3. Andrea Attar & Arnold Chassagnon, 2006. "On moral hazard and nonexclusive contracts," PSE Working Papers halshs-00589101, HAL.
    4. 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.
    5. Beaudry, Paul & Poitevin, Michel, 1993. "Signalling and Renegotiation in Contractual Relationships," Econometrica, Econometric Society, vol. 61(4), pages 745-82, July.
    6. Laurence Ales & Pricila Maziero, 2009. "Adverse Selection and Non-Exclusive Contracts," GSIA Working Papers 2010-E61, Carnegie Mellon University, Tepper School of Business.
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    Cited by:
    1. Han, Seungjin, 2011. "Implicit Collusion in Non-Exclusive Contracting under Adverse Selection," Microeconomics.ca working papers seungjin_han-2011-10, Vancouver School of Economics, revised 02 Apr 2013.

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