No one really knows how much the U.S. government can borrow before global investors get uneasy and begin to… — David Wessel

No one really knows how much the U.S. government can borrow before global investors get uneasy and begin to demand higher interest rates. The national debt exceeded 100 percent of GDP during World War II and then came down as the economy sprinted. But history suggests debt of that level is in the danger zone. Think Argentina, circa 2001. Think Greece, circa 2012.

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