Is the Euro still a viable currency??

Not that long ago, European economists used to mock their American counterparts for having questioned the wisdom of Europe’s march to monetary union. “On the whole,” declared an article published just this past January, “the euro has, thus far, gone much better than many U.S. economists had predicted.”

Oops. The article summarized the euro-skeptics’ views as having been: “It can’t happen, it’s a bad idea, it won’t last.” Well, it did happen, but right now it does seem to have been a bad idea for exactly the reasons the skeptics cited. And as for whether it will last — suddenly, that’s looking like an open question.

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What’s the nature of the trap? During the years of easy money, wages and prices in the crisis countries rose much faster than in the rest of Europe. Now that the money is no longer rolling in, those countries need to get costs back in line.

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But that’s a much harder thing to do now than it was when each European nation had its own currency. Back then, costs could be brought in line by adjusting exchange rates — e.g., Greece could cut its wages relative to German wages simply by reducing the value of the drachma in terms of Deutsche marks. Now that Greece and Germany share the same currency, however, the only way to reduce Greek relative costs is through some combination of German inflation and Greek deflation. And since Germany won’t accept inflation, deflation it is.

The problem is that deflation — falling wages and prices — is always and everywhere a deeply painful process. It invariably involves a prolonged slump with high unemployment. And it also aggravates debt problems, both public and private, because incomes fall while the debt burden doesn’t.

Hence the crisis. Greece’s fiscal woes would be serious but probably manageable if the Greek economy’s prospects for the next few years looked even moderately favorable. But they don’t. Earlier this week, when it downgraded Greek debt, Standard & Poor’s suggested that the euro value of Greek G.D.P. may not return to its 2008 level until 2017, meaning that Greece has no hope of growing out of its troubles.

All this is exactly what the euro-skeptics feared. Giving up the ability to adjust exchange rates, they warned, would invite future crises. And it has.