History strongly supports the proposition that major financial crises are followed by major fiscal crises. "On average," write Carmen Reinhart and Kenneth Rogoff in their new book, This Time Is Different, "government debt rises by 86 percent during the three years following a banking crisis." In the wake of these debt explosions, one of two things can happen: either a default, usually when the debt is in a foreign currency, or a bout of high inflation that catches the creditors out. The history of all the great European empires is replete with such episodes. Indeed, serial default and high inflation have tended to be the surest symptoms of imperial decline.
As the U.S. is unlikely to default on its debt, since it's all in dollars, the key question, therefore, is whether we are going to see the Fed "printing money"—buying newly minted Treasuries in exchange for even more newly minted greenbacks—followed by the familiar story of rising prices and declining real-debt burdens. It's a scenario many investors around the world fear. That is why they are selling dollars. That is why they are buying gold.