This book collects some of the author's most illuminating recent papers on competition policy published since the turn of the millennium. They focus on three main themes: how technological innovation leads to monopolistic market structures and is reciprocally influenced by them; how competition agencies deal with the links from merger to economic efficiency, static and dynamic; and the behavioral problems posed by `tacit' collusion and monopoly power in vertical market chains. Taken together they provide unique insight into competition, mergers and monopolies from one of the leading pioneers...