43 Pages Posted: 29 Sep 2008
Date Written: August 2008
This paper analyzes the impact vertical integration has on upstream collusion when the price of the input is linear. As a first step, the paper derives the collusive equilibrium that requires the lowest discount factor in the infinitely repeated game when one firm is vertically integrated. It turns out this is the joint-profit maximum of the colluding firms. The discount factor needed to sustain this equilibrium is then shown to be unambiguously lower than the one needed for collusion in the separated industry. While the previous literature has found it difficult to reconcile raising-rivals-costs strategies following a vertical merger with equilibrium behavior in the static game, they are subgame perfect in the repeated game studied here.
Keywords: collusion, foreclosure, raising rivals' costs, vertical integration
JEL Classification: D43, L13, L23, L40
Suggested Citation: Suggested Citation
Normann, Hans-Theo, Vertical Integration, Raising Rivals' Costs and Upstream Collusion (August 2008). MPI Collective Goods Preprint, No. 2008/30. Available at SSRN: https://ssrn.com/abstract=1275303 or http://dx.doi.org/10.2139/ssrn.1275303