Antitrust & Competition Policy Blog

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

Thursday, August 29, 2013

(Un)stable vertical collusive agreements

Posted by D. Daniel Sokol

Jean J. Gabszewicz (CORE, Université Catholique de Louvain, Belgique) and Skerdilajda Zanaj (CREA, Universite de Luxembourg) describe (Un)stable vertical collusive agreements.

ABSTRACT: In this paper, we extend the concept of stability to vertical collusive agreements, involving downstream and upstream firms, using a setup of successive Cournot oligopolies. We show that a stable vertical agreement always exists: the unanimous vertical agreement involving all downstream and upstream firms. Thus, stable vertical collusive agreements exist even for market structures in which horizontal cartels would be unstable. We also show that there are economies for which the unanimous agreement is not the only stable one.

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