We hand-collect and standardize information describing all 3,055 antitrust lawsuits brought by the Department of … economic outcomes of a non-tradable industry in states targeted by DOJ antitrust lawsuits to outcomes of the same industry in … other states that were not targeted. We document that DOJ antitrust enforcement actions permanently increase employment by 5 …

in the Horizontal Merger Guidelines. Through a model of enforcement, we find that agencies challenge mergers they expect …We document the effects of a comprehensive set of US retail mergers. On average, prices increase by 1.5% and quantities … decrease by 2.3%, with significant heterogeneity in outcomes across mergers. Price changes correlate with the screens codified …

Regulators around the world are discussing, or taking action to limit, self-preferencing by large platforms. This paper …

Antitrust enforcement in the United States has declined since the 1960s. Building on several new datasets, we argue … antitrust law in confirmation hearings. We find little evidence that academic ideas played an important role in the decline of … antitrust enforcement except where they coincided with the interests of big business, which appears to have exercised influence …

Regulators are responding to growing platform power with curbs on platforms' potentially biased exercise of power …

We examine merging firms' additions and removals of products for a sample of 66 mergers across a wide variety of … consumer packaged goods markets. We find that mergers lead to a net reduction in the number of products offered by merging …

that has rapidly become influential for antitrust policy. We explain that the empirical evidence relating to concentration … trends, markup trends, and the effects of mergers does not actually show a widespread decline in competition. Nor does it … provide a basis for dramatic changes in antitrust policy. To the contrary, in many respects the evidence indicates that the …

research in the areas of collusion and merger enforcement. Research relating to both collusion and mergers has made significant … which mergers get proposed to antitrust agencies and optimal policy in the face of that selection. A feature of recent …This survey examines recent developments in economic research relating to antitrust, paying specific attention to …

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 …