Antitrust authorities have imposed firewalls between the previously separate divisions of newly vertically integrated firms in several industries, to address concerns that access to horizontal rivals' proprietary information may reduce competition. This paper evaluates a specific antitrust...

This paper compares the equilibrium outcomes from a recently developed model of procurement competition with differentiated products to those from two analytically tractable models that might naturally be considered as suitable proxies. The models differ in what sellers know about the buyer's...