From the purely juristic point of view, the norm can only have direct effect if it is clear, complete, precise and does not contain clarificatory references to other norms (the element of executability or ratione materiae) and if it concerns a definable group of individuals (the element of determination or ratione personae). The narrower and the better articulated the norm, the easier it is to assign to it a direct effect. In reality, the level of precision may vary. The term ‘direct effect’ is sometimes confusingly used for defining the nature of EU legislative acts, when distinguishing the acts requiring a separate domestic implementation (e.g. directives) and those not requiring such implementation (e.g. regulations). EU regulations always have direct applicability, but not all provisions of the directly applicable (i.e. not requiring further transposition by a domestic legislative act) EU laws, are necessarily directly effective; and vice versa, even some provisions of the EU legislative acts, which are not designed to be directly applicable (i.e. EU directives) may become directly effective if not transposed by the Member State in due course. The concept of direct effect is also closely linked – but again only partially – with the principle of primacy of (some provisions of) one legal system over the other. The fact that the provisions of international or EU law may have primacy over the provisions of domestic law does not automatically imply the direct effectiveness of such provisions; and vice versa, not all directly effective provisions of EU law have necessarily the primacy over the domestic law.
The issue of direct effect is particularly relevant in the context of EU law. Historically, the Court of Justice of the European Union (CJEU) designated direct effectiveness to many provisions of EU primary and secondary law (starting with the seminar van Gend en Loos, 1963) paving thereby the way to a more harmonious and comprehensive European integration. In this sense, the former is instrumental to the latter.
In the context of EU competition law, the provisions of Art 101 and 102 TFEU were confirmed as having horizontal direct effect in 1973 (BRT v SV SABAM, 1974). The concept of horizontal direct effect continues to have a paramount importance in the field of private enforcement as it enables bringing stand-alone and follow-on actions against the infringers of the provisions of Art 101 and 102 TFEU. This is particularly relevant for the follow-on actions, relieving the plaintiffs from various procedural burdens related to the discovery of evidence and proof of the infringement, allowing them to focus mainly on the issues of proving harm and showing causality. But stand-alone actions are not uncommon too.
The compensatory rationale was established in a landmark 2001 Courage v Crehan judgment, in which the individual right to claim damages for the infringement of competition law was explicitly acknowledged (This was elaborated further by expanding the right to damages to the loss of profits in Manfredi, 2006). An important spillover of this ruling was a much wider and consistent use of the mechanism of private enforcement at the national courts of the EU Member States.
Direct effect of EU competition law does not answer the question of which jurisdiction – domestic or EU – has primacy over applying the law, it only stipulates conditions under which the provisions of EU competition law may be applied by individuals in cases of breach of EU competition law. The parallelism in applying the provisions of Art 101 and 102 TFEU has been reaffirmed, institutionalised and calibrated by the Modernisation Regulation of 2003. While ideally the provisions of the directly effective EU norms must be read and interpreted uniformly in all Member States, the remedies available for individuals may differ from one national legal system to the other, as the relevant norms could only be directly enforced via the substantive and procedural mechanisms of domestic legal systems, which are inherently unique and can be very different. A number of effective steps aimed at the unification of EU rules and practices related to damages in competition law cases have been introduced, though room for further improvements remains wide as the issue of damages goes to the heart of the procedural and substantive specificities of the national laws of EU Member States. One of the most problematic issues in this respect is the binding effect of national competition authorities’ decisions declaring infringements of Articles 101 and 102 TFEU (Miguel Sousa Ferro). The doctrine of direct effect plays a paramount role in integrating and approximating the national legal systems of the EU Member States and contributes to the increasing role of European law in all EU Member States.