This paper provides a new explanation for tying that is not based on any of the standard explanations -- efficiency …

include pre-existing monopoly power as well. We show that the existence of monopoly power has two offsetting effects on … welfare. First, the environmental policy reduces monopoly profits, and the negative effect on income increases labor supply in … interaction with the pre-existing monopoly distortion further exacerbates the labor supply distortion. This second effect is …

show that in selection markets four principles of the United States Horizontal Merger Guidelines are often reversed …

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 …

, average HMO premiums are estimated to be 3.2% higher than they would have been absent any hospital merger activity during the …

Applying principles of merger evaluation to the health care industry in general, and to hospital markets in particular …

merger wave. The evidence indicates that the efficiency of the majority of acquiring firms increases following an acquisition …. Based on the parameter estimates, we calculate merger welfare effects. We find that total welfare increased by $583 …

-level productivity. We also examine whether M&As increase efficiency through reallocation of production to more efficient plants or … are robust to a range of approaches to address the endogeneity of firms' merger decisions …