There have been many spikes in the euro zone’s crisis fever in the past, of course, with a bailout here or a stopgap measure there seeming to calm things for a while. But this time, Europe may have reached a moment when the currency union’s survival depends on a powerful, convincing response.

Greece, progenitor of the debt debacle, is in political turmoil once again, and this time it is in danger of dropping out of the euro zone altogether. Spain, with one of the region’s largest economies, is in the grip of a banking crisis, and there is a growing sense that the danger to Spanish banks is of an entirely different order of magnitude from that in suffering but small Greece.

The clearest danger signal may be the euro currency itself. It is at a two-year low against the dollar, as investors who can do so are pulling money out of the euro region.

via Central Banker Says Euro Zone Structure Is ‘Unsustainable’ – NYTimes.com.