counterfactual experiments. The analysis is performed on data for a merger wave in U.S. radio that occurred between 1996 and 2006 … advertisers in large markets. Counterfactuals reveal that extra product variety created by post-merger repositioning increased …

a single theory – that the merger would create a dominant buyer (or group of buyers) that would exploit small, powerless … a comprehensive analysis of the role of buyer power in merger enforcement. It defines the types of buyer power … combinations that increase such power are beneficial, the article identifies ten situations in which a merger that augments …

There seems to be consensus that the Department of Justice's 1984 Vertical Merger Guidelines do not reflect either … are verifiable, merger-specific and sufficient to reverse the potential anticompetitive effects; (iv) The agencies should … unconcentrated markets; (v) The agencies should consider adopting rebuttable anticompetitive presumptions that a vertical merger …

The past forty years have witnessed a remarkable transformation in horizontal merger enforcement in the United States … using merger enforcement data and a survey we conducted of merger practitioners that the decline in antitrust enforcement is … ongoing, especially at the current Justice Department. We then argue in favor of reinvigorating horizontal merger enforcement …