Antitrust & Competition Policy Blog

Editor: D. Daniel Sokol
University of Florida
Levin College of Law

Friday, May 6, 2011

Non-Exclusive Competition under Adverse Selection

Posted by D. Daniel Sokol

Andrea Attar (University of Rome "Tor Vergata"), Thomas Mariotti (Toulouse School of Economics), and François Salanié (Toulouse School of Economics) describe Non-Exclusive Competition under Adverse Selection.

ABSTRACT: Consider a seller of a divisible good, facing several identical buyers. The quality of the good may be low or high, and is the seller's private information. The seller has strictly convex preferences that satisfy a single-crossing property. Buyers compete by posting arbitrary menus of contracts. Competition is non-exclusive in that the seller can simultaneously and secretly trade with several buyers. We fully characterize conditions for the existence of an equilibrium. Equilibrium aggregate allocations are unique. Any traded contract must yield zero profit. If a quality is indeed traded, then it is traded efficiently. Depending on parameters, both qualities may be traded, or only one of them, or the market may break down completely to a no-trade equilibrium

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