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A Note on the Convergence to Competitive Equilibria in Economies with Moral Hazard

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Author Info
Alberto Bisin
Piero Gottardi
Danilo Guaitoli

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Abstract

We examine the conditions under which competitive equilibria can be obtained as the limit, when the number of strategic traders gets large, of Nash equilibria in economies with asymmetric information on agents' effort and possibly imperfect observability of agents' trades. Convergence always occur when either effort is publicly observed (no matter what is the information available to intermediaries on agents' trades); or effort is private information but agents' trades are perfectly observed; or no information at all is available on agents' trades. On the other hand, when each intermediary can observe its trades with an agent, but not the agent's trades with other intermediaries, the (Nash) equilibria with strategic intermediaries do not converge to any of the competitive equilibria, for an open set of economies. The source of the difficulties for convergence is the combination of asymmetric information and the restrictions on the observability of trades which prevent the formation of exclusive contractual relationships and generate barriers to entry in the markets for contracts.

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Publisher Info
Paper provided by Department of Economics and Business, Universitat Pompeu Fabra in its series Economics Working Papers with number 381.

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Date of creation: Dec 1998
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Handle: RePEc:upf:upfgen:381

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Web page: http://www.econ.upf.edu/

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Related research
Keywords: Asymmetric information; exclusivity; competitive equilibrium;

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Find related papers by JEL classification:
D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information
D50 - Microeconomics - - General Equilibrium and Disequilibrium - - - General

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References listed on IDEAS
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  1. 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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  2. 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!]
  3. 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)
  4. Bruno Biais & David Martimort & Jean-Charles Rochet, 2000. "Competing Mechanisms in a Common Value Environment," Econometrica, Econometric Society, vol. 68(4), pages 799-838, July.
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Cited by:
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  1. 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)
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