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Competitive Pooling: Rothschild-Stiglitz Reconsidered

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Author Info
Pradeep Dubey
John Geanakoplos
Abstract

We build a model of competitive pooling, which incorporates adverse selection and signaling into general equilibrium. Pools are characterized by their quantity limits on contributions. Households signal their reliability by choosing which pool to join. In equilibrium, pools with lower quantity limits sell for a higher price, even though each household's deliveries are the same at all pools. The RothschildStiglitz model of insurance is included as a special case. We show that by recasting their hybrid oligopolistic-competitive story in our perfectly competitive framework, their separating equilibrium always exists (even when they say it does not) and is unique. © 2001 the President and Fellows of Harvard College and the Massachusetts Institute of Technology

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Article provided by MIT Press in its journal The Quarterly Journal of Economics.

Volume (Year): 117 (2002)
Issue (Month): 4 (November)
Pages: 1529-1570
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Handle: RePEc:tpr:qjecon:v:117:y:2002:i:4:p:1529-1570

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  1. Alberto Martin, 2007. "On Rothschild–Stiglitz as Competitive Pooling," Economic Theory, Springer, vol. 31(2), pages 371-386, May. [Downloadable!] (restricted)
    Other versions:
  2. Calcagno, R. & Wagner, W., 2003. "The inefficiency of the stock market equilibrium under moral hazard," Discussion Paper 107, Tilburg University, Center for Economic Research. [Downloadable!]
  3. Alberto Martin, 2009. "A Model of Collateral, Investment, and Adverse Selection," Economics Working Papers 1136, Department of Economics and Business, Universitat Pompeu Fabra. [Downloadable!]
    Other versions:
  4. 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!]
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