"Greece's debts are all denominated in euros, but it isn't clear who holds how much of those debts. For that reason, the consequences of a national bankruptcy would be incalculable. Greece is just as systemically important as a major bank."

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I was an advocate of the deregulation movement and I made - along with a lot of other smart people - a fundamental mistake, which is that deregulation works fine in industries which do not pervade the economy. The financial industry undergirded the entire economy and if it is made riskier by deregulation and collapses in widespread bankruptcies as what happened in 2008, the entire economy freezes because it runs on credit.

— Richard Posner