This reference book by Russo, Schinkel, Guenster and Carree offers a classification and analysis of all European Commission decisions adopted pursuant to European antitrust rule (i.e. Articles 101, 102 and 106 of the FEU Treaty) from the Treaty of Rome of 1957, up to and including 2009. It also includes a sample of landmark European merger cases. The decisions are organized according to the principal economic theory applied in the case. For each economic category, we describe in a fixed template format the seminal decision(s) that became a reference point for that type of (anti)competitive behavior. All subsequent decisions in which the same economic principle was applied are listed chronologically.