either merge with a similar component producer (horizontal merger) or a complementary one (vertical merger) of a composite …, higher marginal cost savings are required for a horizontal merger in a composite industry not to result in a price increase …

assumption were held, a positive external effect of a proposed merger would represent a sufficient condition to allow the merger … theory, moreover, demonstrates that privately unprofitable mergers can be the result of rational action. Therefore, we drop … this restrictive assumption and allow for unprofitable mergers to occur. This exerts a considerable impact on merger policy …

This is a survey of the economic principles that underlie antitrust law and how those principles relate to competition …

, merger laws and enforcement practices, econometric methods for analyzing prospective horizontal mergers, and evidence …

discuss how mergers affect competing media platforms’ choice of genre. In the third part, we discuss how to take on merger … control in two-sided media markets. Motivated by some actual merger cases, we also discuss how antitrust authorities might err …