Despite the surge in federal debt to the public during the past 18 months—to $8.6 trillion from $5.5 trillion—inflation and long-term interest rates, the typical symptoms of fiscal excess, have remained remarkably subdued. This is regrettable, because it is fostering a sense of complacency that can have dire consequences.

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— Alan Greenspan: U.S. Debt and the Greece Analogy - WSJ.com