For decades it seemed clear that EC competition law was enforceable effectively at the national level, and ECJ case law has continued to bear this out. In recent years, however, the Commission has been proposing harmonization of national rules of procedure in competition cases, implying that procedural autonomy is insufficient on its own to produce an effective enforcement system in this area. As the authors of this book clearly demonstrate, this suggests a binary system governing the enforcement of EC Articles 81 and 82: namely, that led by the Commission through directives and eventual regulations, and that built on ECJ principles in areas not dealt with by such Community instruments.