Only large mergers must be reported to the US government, so many anticompetitive deals may effectively avoid antitrust scrutiny. This paper uses data from the dialysis industry to show that premerger notifications are essential to antitrust enforcement and that ensuing enforcement actions...

In the last decades, many European hospital markets witnessed a wave of mergers leading to increased levels of market concentration. The effects of hospital mergers and the effectiveness of competition enforcement have been discussed by politicians but understudied by academics. This report...