By examining the issue of collusion in EU and US competition law, this book suggests possible strategies for improving the antitrust enforcement against parallelism, by exploiting the most advanced achievements of economic analysis. The book contains a suggested approach to collusion, in ex ante and ex post perspectives. By moving from the analysis of the state of art, in terms of law, case law, and scholarship, Marilena Filippelli analyses inconsistencies and failures in the current antitrust enforcement toward collusion and develops a workable parameter for the issue of collective...