The challenge of effective merger enforcement is tremendous. U.S. antitrust agencies must, by statute, quickly forecast … estimating the price effects of mergers. We also describe how evidence from merger retrospectives can be used to evaluate the …

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

mergers. We then simulate a representative set of U.S. mergers in order to evaluate merger review thresholds. Our main … lenient 2010 merger guidelines and unharmed, on average, under enforcement of the more stringent 1982 merger guidelines. We …

, we present a method for measuring undisclosed merger activity that relies on financial accounting reporting requirements …

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 …

Merger control authorities may approve a merger based on a so-called 'efficiency defence'. An important aspect in … clearing mergers is that the efficiencies need to be merger-specific. Joint ventures, and in particular research joint ventures …

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 …

of oligopoly concerns resulting from mergers. In this paper, we provide a critique of Bork's views on merger policy from … The Antitrust Paradox. Many of Bork's recommendations have been implemented over time and have improved merger analysis …. Bork's proposed horizontal merger policy, however, was too permissive. In particular, the empirical record shows that …