In this article, I explain the inadequacy of our current state of knowledge regarding the effectiveness of antitrust … policy towards mergers. I then discuss the types of data that one must collect in order to be able to perform an analysis of … the effectiveness of antitrust policy. There are two types of data one requires in order to perform such an analysis. One …

In this paper we review issues relating to antitrust and competition in health care markets. The paper begins with a … brief review of antitrust legislation. We then discuss whether and how health care is different from other industries in … ways that might affect the optimality of competition. The paper then focuses on the main areas in which antitrust has been …

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 … the competitive effects of mergers that occur in virtually every sector of the economy to determine if mergers can proceed …

American history occurred, and his administration did not attempt to use antitrust laws to restrain any of those mergers. His …We study the importance of discretion in antitrust enforcement by analyzing the response of asset prices to the sudden … accession of Theodore Roosevelt to the presidency. During McKinley's term in office the largest wave of merger activity in …

Antitrust authorities search public documents to discover anticompetitive mergers. Thus, investor disclosures may alert … disclosure thresholds stipulated by securities law. We find that releasing information to investors poses antitrust risk. Second …, we present a method for measuring undisclosed merger activity that relies on financial accounting reporting requirements …

computationally, allows firms to invest or propose mergers according to the relative profitability of these strategies. An antitrust … authority is able to block mergers at some cost. We examine the optimal policy when the antitrust authority can commit to a …We study optimal merger policy in a dynamic model in which the presence of scale economies implies that firms can …

We analyze the optimal dynamic policy of an antitrust authority towards horizontal mergers when merger proposals are … potential future mergers, the characteristics of which may not yet be known to the antitrust authority. We show that, in many … endogenous and occur over time. Approving a currently proposed merger will affect the profitability and welfare effects of …

District Court in November 2002. The wave of follow-on private antitrust suits filed against Microsoft also appears to be …

Sunk costs play a central role in antitrust economics, but are often misunderstood and mismeasured. I will try to … clarify some of the conceptual and empirical issues related to sunk costs, and explain their implications for antitrust … just as relevant for antitrust analysis as the direct cost of a machine or a factory …