We examine horizontal mergers amongst Part D insurers with the aim of decomposing market power, cost efficiency, and … no cost efficiency effects …

We describe a simple initial indicator of whether a proposed merger between rivals in a differentiated product industry … from the merger, based on the price/cost margins of the merging firms' products and the extent of direct substitution …

scrutinized by the European Commission between 1995 and 2014. We show that concentration, as measured by the market-specific post-merger … dimension analyzed. Strict past merger enforcement negatively correlates with concentration. Yet, this effect is stronger in the …

which lead to two opposing effects on upstream merger incentives: rst a standard double mark-up problem and second a … bargaining e¤ect. The former creates merger incentives while the later induces suppliers to bargain separately. When buyer power …

differential merger outcomes are caused mostly by firms' technology or product market attributes. Furthermore, empirical merger …. We allow the merger responses to vary across firms, even after controlling for regressors, and apply a random …

uniform price increases throughout all the goods in the candidate relevant market, since 1984 the versions of the U.S. Merger … recent contributions to the literature, we propose a unified framework for merger simulations and for the so-called HMT in …