Introduction
In its more than seven decades of history European integration has gone through many stages of development. Some of them were incremental, but many more rather sudden, triggered or at least profoundly influenced by legal predicaments and political impasses, following the proverbial advice to ‘never let a good crisis go to waste’. The policy areas that are broadly abridged under the term Economic and Monetary Union (EMU) form no exception in this regard. EMU is deeply rooted in and following the inherent logic of political integration through gradual economic integration proclaimed in the well-known Schuman Declaration and thereafter given shape through the Treaty establishing the Coal and Steel Community (ECSC) and the subsequent Treaty establishing the European Economic Community. Yet, it was the Treaty on European Union (Maastricht Treaty/TEU), which was meant to put an end to the at times fiercely led (academic) debates on the future direction of European integration and its democratic credentials, that finally provided the necessary legal impetus for the establishment of an economic and monetary union and the creation of a supranational, single European currency.