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 analyze the efficiency defense in merger control. First, we show that the relationship between exogenous efficiency … find that merger proposals are largely aligned with a proper social welfare analysis which explicitly considers the without … merger counterfactual. We demonstrate that the merger specificity requirement does not help much to select socially desirable …

This paper introduces the Werden-Froeb Index (WFI) to assist in evaluating merger-specific efficiencies in horizontal … mergers. The index measures the weighted average reduction in marginal costs required to restore pre-merger equilibrium prices … and quantities after the (full or partial) merger is consummated. The WFI is well defined, objective and robust, and it …

We study upstream horizontal mergers and their potential efficiency gains. We show that an upstream horizontal merger … and decreases wholesale prices when downstream competition is not too strong. Examining whether the merger’s potential …