We provide an in-depth analysis of the price effects of two hospital mergers that occurred in the north shore suburbs of Chicago in early 2000: Evanston Northwestern Healthcare's (ENH) purchase of Highland Park Hospital (HPH) and the merger of St. Therese Medical Center (STMC) and Victory...

Certificates of public advantage (COPAs) grant antitrust immunity to merging hospitals conditional on active state regulation. We investigate the long-run effects of the four horizontal hospital mergers shielded with COPAs prior to 2015. We find that COPA regulation, if properly designed, can...