Bertrand and Walras Equilibria Under Moral Hazard

Pierre Chiappori and Alberto Bennardo ()

No 3650, CEPR Discussion Papers from C.E.P.R. Discussion Papers

Abstract: We consider a simple model of competition under moral hazard with constant return technologies. We consider preferences that are not separable in effort: marginal utility of income is assumed to increase with leisure, especially for high-income levels. We show that, in this context, Bertrand competition may result in positive equilibrium profit. This result holds for purely idiosyncratic shocks when only deterministic contracts are considered, and extends to unrestricted contract spaces in the presence of aggregate uncertainty. Finally, these findings have important consequences upon the definition of an equilibrium. We show that, in this context, a Walrasian general equilibrium a la Prescott-Townsend may fail to exist: any 'equilibrium' must involve rationing.

Keywords: Moral hazard; Competition; Rationing (search for similar items in EconPapers)
JEL-codes: D82 (search for similar items in EconPapers)
Date: 2002-11
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Related works:
Working Paper: Bertrand and Walras Equilibria Under Moral Hazard (2003)
Working Paper: Bertrand and Walras equilibria under moral hazard (2002)
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