The EU's competences: The 'vertical' perspective on the multilevel system

From the outset, European integration was about the transfer of powers from the national to the European level, which evolved as explicit bargaining among governments or as an incremental drift. This process was reframed with the competence issue entering the agenda of constitutional policy. It now concerns the shape of the European multilevel polity as a whole, in particular the way in which powers are allocated, delimited and linked between the different levels. This Living Review article summarises research on the relations between the EU and the national and sub-national levels of the member states, in particular on the evolution and division of competences in a multilevel political system. It reviews normative reasons justifying an appropriate allocation of competences, empirical theories explaining effective structures of powers and empirical research.