That may lead to a dilemma between the requirements of a supranational currency, and the political pattern in Europe, which will continue to be determined by the national states and their policies. The euro needs a high degree of flexibility in the economies of the participating countries. But there is no European economic and structural policy which can ordain such necessary flexibility from above.
A healthy economy needs them both: the former provides good rules and high-quality public services, and intervenes in areas where social returns are high but private business is insufficient, and the latter generates dynamic and innovative firms able to promote their work and to be rewarded for the quality of their output.