Felix Salmon on the Liquidity Crisis

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He captures it thusly
What is true is that Europe is in the middle of a textbook liquidity crisis. Banks are not lending to each other — and the ECB isn’t stepping in to solve the problem. This is a serious structural issue with the way that the European monetary system was constructed: the ECB is tasked only with guarding inflation, and not with ensuring the health of the banking system. Individual national central banks are meant to do that. But they can’t print money — only the ECB can. So when there’s a liquidity crisis, no one’s able to step in and solve it.
Note quite close to Krugman's one sentence, but close enough, eh?

What has happened, it turns out, is that by going on the euro, Spain and Italy in effect reduced themselves to the status of third-world countries that have to borrow in someone else’s currency, with all the loss of flexibility that implies
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