One of the main concerns raised by the decentralization of EU competition law enforcement related to the risk of different competition authorities prosecuting and sanctioning the same cross-border anticompetitive practice, in breach of the ne bis in idem principle (protection against double jeopardy, as provided for by Art. 50 of the EU Charter of Fundamental…

We live in a world of network antitrust enforcement, to borrow the expression introduced by H. First a decade ago (here) to refer to the loose arrangements among the federal agencies and/or State Attorneys General offices presiding over the enforcement of federal and state antitrust laws in the US. This is increasingly the case on…