Two Dollar Fallacies

One frequently hears two key arguments from economists who dismiss the fear of a run on the dollar: the dollar is a reserve currency, and it carries fewer risks than other currencies. Unfortunately, neither argument is persuasive.

CAMBRIDGE – The United States’ current fiscal and monetary policies are unsustainable. The US government’s net debt as a share of GDP has doubled in the past five years, and the ratio is projected to be higher a decade from now, even if the economy has fully recovered and interest rates are in a normal range. An aging US population will cause social benefits to rise rapidly, pushing the debt to more than 100% of GDP and accelerating its rate of increase. Although the Federal Reserve and foreign creditors like China are now financing the increase, their willingness to do so is not unlimited.

Likewise, the Fed’s policy of large-scale asset purchases has increased commercial banks’ excess reserves to unprecedented levels (approaching $2 trillion), and has driven the real interest rate on ten-year Treasury bonds to an unprecedented negative level. As the Fed acknowledges, this will have to stop and be reversed.

While the future evolution of these imbalances remains unclear, the result could eventually be a sharp rise in long-term interest rates and a substantial fall in the dollar’s value, driven mainly by foreign investors’ reluctance to continue expanding their holdings of US debt. American investors, fearing an unwinding of the fiscal and monetary positions, might contribute to these changes by seeking to shift their portfolios to assets of other countries.

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