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The evolution of the European single currency is still uncertain. While the enlargement of the Euro Club continues, there is a likelihood that members facing systemic difficulties may have to leave it. To wrap-up, whatever the solutions that may be found for the current euro crisis in the short or long term, and unless globalization and regionalization slowdown to a great extent, it is convenient to recall John Stuart Mill, a 19th century economist and a firm advocate of freedom: “So much barbarism still remains in the transactions of the most civilized nations, that almost all independent countries choose to assert their nationality by having, to their own convenience and that of their neighbors, a peculiar currency of their own”. A lesson learned from the current crisis is that for a State to participate in a monetary union, or at least to accept the rules of a more or less deep and intense international monetary harmonization, and take advantage of that, it is indispensable that that State establishes a large internal macroeconomic discipline. And, consequently, that it safely handles the main leverages of the economic policy.