Recent high-profile deals in high tech, media, and other industries have generated serious concerns that the merger laws are not adequate to address (1) "killer" acquisitions in which a dominant company acquires a competitor that is small today but might otherwise grow into a formidable competitor (such as Facebook/Instagram); (2) vertical transactions that combine companies in different but adjacent markets (such as AT&T/Time Warner); and (3) how to determine whether potential anticompetitive harms are outweighed by claimed procompetitive efficiencies (such as in T-Mobile/Sprint). This seminar will explore the tools that antitrust enforcement agencies have to determine whether these and other transactions are anticompetitive and will ask the ultimate question: Do we need to amend the antitrust laws to maintain a competitive economy?