Mergers and Marginal Costs : New Evidence on Hospital Buyer Power

We estimate the effects of horizontal mergers on marginal cost efficiencies - an ubiquitous merger justification - using data containing supply purchase orders from a large sample of US hospitals 2009-2015. The data provide a level of detail that has been difficult to observe previously, and a variety of product categories that allows us to examine economic mechanisms underlying "buyer power." We find that merger target hospitals save on average $176 thousand (or 1.5 percent) annually, driven by geographically local efficiencies in price negotiations for high-tech "physician preference items." We find only mixed evidence on savings by acquirers