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

The legitimacy of the world trading system is under growing attack, as challenges to its conformity with norms of … fairness and social justice are increasingly voiced by citizens and their governments around the world. Taking a novel "bottom …-related fairness concerns of their citizens. More generally, our findings point to a detailed understanding of real-world perceptions …

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

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 …

guidelines reflect a substantial consensus on the appropriate template for merger assessment. Nevertheless, official protocols …

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 …

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 …

In this paper we propose a method to evaluate the effectiveness of U.S. horizontal merger policy and apply it to the … merger had little effect …