​A regulatory idea conducted this work: the need to connect the economic rationale of the theory of currency areas with the current EU institutional frame of the European monetary unification process. The latter includes the recent revamping of fiscal rules of the Stability and Growth Pact, and calls for enhancing 'flexicurity' in EU labour markets. The lack of EU political leadership is a dead-weight loss to build a genuine economic and monetary union, and risks to blow-up the whole project. Further, it undermines the internal macroeconomic logic of a single currency like the euro,...