Although subsequent administrations have continued
reviewing vertical mergers, the Chicago School's view that these deals generally do not pose threats to competition has remained
dominant.139 Rejection
of vertical tie - ups —
standard through the 1960s and 1970s — is extremely rare today; 140 in instances where agencies spot potential harm, they tend to impose conduct remedies or require divestitures rather than block the deal outright.141 The Obama Administration took this approach with two
of the largest vertical deals
of the last decade: Comcast / NBC and Ticketmaster / LiveNation.