The problem is that, in a world of floating exchange rates, as Italy was before the euro, if one country is subjected to a shock which requires it to cut wages, it cannot do so with a modern kind of control and regulation system. It is much easier to do it by letting the exchange rate change. Only one price has to change, instead of many.
Milton FriedmanThe world runs on individuals pursuing their self interests. The great achievements of civilization have not come from government bureaus. Einstein didn't construct his theory under order from a bureaucrat. Henry Ford didn't revolutionize the automobile industry that way.
Milton FriedmanThere is one and only one social responsibility of business - to use it resources and engage in activities designed to increase its profits so long as it stays within the rules of the game, which is to say, engages in open and free competition without deception or fraud.
Milton Friedman