The Federal Reserve has never been more famous than it is today. It drew praise, and ire, for its handling of the financial crisis a decade ago, and the extraordinary measures it took subsequently to stimulate the U.S. economy have made it an important driver of financial markets. Meanwhile, President Trump has made its chairman, Jerome Powell, a household name by frequently criticizing the central bank’s policies on Twitter and to the press.

A movement, meanwhile, has been brewing among economists, financial-services professionals and central bankers to encourage a rethinking of the technology of currency — those paper notes we carry in our wallets — with an eye toward issuing a digital currency. Some argue that could give central banks the tools necessary to break free of chronic disinflation and persistently low or negative interest rates, while providing Americans a risk-free means to transact in a world where digital commerce constitutes a growing share of the economy.

“The debate isn’t about whether we need [a digital currency],” Michael Bordo, an economist at Rutgers University and a fellow at the Hoover Institution, the public-policy think tank at Stanford University, told MarketWatch. “It’s about how you do it.”

Americans already use digital currency for most of their purchases[1]. In 2018, they used physical dollars for just 26% of transactions, versus 62% with digital currency, which includes credit cards, debit cards and bank transfers, according to the Fed.

A central-bank digital currency could work much like the mostly bank-issued digital money Americans use today, with some key differences. First, it would be backed by the full faith and credit of the United States government and, therefore, risk-free. The local bank that manages your savings account could fail at any time and the dollars in your account (beyond those insured by the FDIC) would disappear. A Fed “e-dollar” would persist as long as the U.S. government does.

More important, an e-dollar could pay interest. The idea that cash should pay interest dates back to monetary economist Milton Friedman, who argued in 1969 that the most efficient monetary system would be one in which cash bears interest equal to that of short-term government bonds, to encourage greater use of the dollar.

In good times, earning interest on your e-dollars would simply make everyone a little richer, but in times of crisis it could also be used to institute negative interest rates, essentially a tax on holding cash. Such a policy would likely strike Americans as governmental overreach, but, Bordo argued, the alternative is worse.

Central bank ammunition

The current economic expansion is the longest in U.S. history, but warning signs of a recession abound, including slowing economic growth and the recent inversion of the yield curve[2] for U.S. government debt. In response, the Fed reduced interest rates in July and hinted at more cuts to come. But economists worry that the Fed will...

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