in the Horizontal Merger Guidelines. Through a model of enforcement, we find that agencies challenge mergers they expect …

research in the areas of collusion and merger enforcement. Research relating to both collusion and mergers has made significant …-based measurement) and theoretical work in advancing our understanding of collusive and merger-related phenomena …

method to study merger effects on firm entry and product variety in the retail craft beer market in California. We simulate …

traditional merger analysis. Neither subsequent entry nor follow-on mergers necessarily mitigate the problem …

We analyze the optimal dynamic policy of an antitrust authority towards horizontal mergers when merger proposals are … endogenous and occur over time. Approving a currently proposed merger will affect the profitability and welfare effects of … surplus by using a completely myopic merger review policy that approves a merger today if and only if it does not lower …

We study optimal merger policy in a dynamic model in which the presence of scale economies implies that firms can … the period the merger is proposed. We also find that the ability to commit can lead to a significant welfare improvement …

is data on the relevant market pre and post merger. The second is data on the specific predictions of the government … agencies about the market post-merger. A key point of this article is to stress how weak an analysis of only the first type of … post merger are surprisingly poor guides for analyzing merger policy. It is only when the second type of data is combined …