Hospitals merge to constrain costs and improve quality. Although hospital consolidation can yield substantial cost and qualitative efficiencies, it can also harm competition by creating market power. Can the agencies and the courts strike the appropriate balance between the quality improvements...

Despite the continuing US hospital merger wave, it remains unclear how mergers change, or fail to change, hospital behavior and performance. We open the "black box" of hospital practices through a mega-merger between two for-profit chains. Benchmarking the merger's effects against the acquirer's...