Well, why was the bumblebee able to fly for a while? Why did the euro seem to work for its first eight or so years? Because the structure’s flaws were papered over by a boom in southern Europe. The creation of the euro convinced investors that it was safe to lend to countries like Greece and Spain that had previously been considered risky, so money poured into these countries — mainly, by the way, to finance private rather than public borrowing, with Greece the exception.

And for a while everyone was happy. In southern Europe, huge housing bubbles led to a surge in construction employment, even as manufacturing became increasingly uncompetitive. Meanwhile, the German economy, which had been languishing, perked up thanks to rapidly rising exports to those bubble economies in the south. The euro, it seemed, was working.

Then the bubbles burst. The construction jobs vanished, and unemployment in the south soared; it’s now well above 20 percent in both Spain and Greece. At the same time, revenues plunged; for the most part, big budget deficits are a result, not a cause, of the crisis. Nonetheless, investors took flight, driving up borrowing costs. In an attempt to soothe the financial markets, the afflicted countries imposed harsh austerity measures that deepened their slumps. And the euro as a whole is looking dangerously shaky.

What could turn this dangerous situation around? The answer is fairly clear: policy makers would have to (a) do something to bring southern Europe’s borrowing costs down and (b) give Europe’s debtors the same kind of opportunity to export their way out of trouble that Germany received during the good years — that is, create a boom in Germany that mirrors the boom in southern Europe between 1999 and 2007. (And yes, that would mean a temporary rise in German inflation.) The trouble is that Europe’s policy makers seem reluctant to do (a) and completely unwilling to do (b).

...

So could the euro be saved? Yes, probably. Should it be saved? Yes, even though its creation now looks like a huge mistake. For failure of the euro wouldn’t just cause economic disruption; it would be a giant blow to the wider European project, which has brought peace and democracy to a continent with a tragic history.

But will it actually be saved? Despite Mr. Draghi’s show of determination, that is, as I said, very much in doubt.

http://www.nytimes.com/2012/07/30/opinion/krugman-crash-of-the-bumblebee.html