The mighty US dollar continues to reign supreme in global markets. But the greenback’s dominance may well be more fragile than it appears, because expected future changes in China’s exchange-rate regime are likely to trigger a significant shift in the international monetary order.

For many reasons, the Chinese authorities will probably someday stop pegging the renminbi to a basket of currencies, and shift to a modern inflation-targeting regime under which they allow the exchange rate to fluctuate much more freely, especially against the dollar. When that happens, expect most of Asia to follow China. In due time, the dollar, currently the anchor currency for roughly two-thirds of world GDP, could lose nearly half its weight.

Considering how much the United States relies on the dollar’s special status to fund massive public and private borrowing, the impact of such a shift could be significant.  The sustainability of growing US debt might be called into question.

The long-standing argument for a more flexible Chinese currency is that China is simply too big to let its economy dance to the US Federal Reserve’s tune, even if Chinese capital controls provide some measure of insulation. China’s GDP (measured at international prices) surpassed that of the US back in 2014 and is still growing far faster than the US and Europe, making the case for greater exchange-rate flexibility increasingly compelling.

A more recent argument is that the dollar’s centrality gives the US government too much access to global transactions information. This is also a major concern in Europe. In principle, dollar transactions could be cleared anywhere in the world, but US banks and clearing houses have a significant natural advantage, because they can be implicitly (or explicitly) backed by the Fed, which has unlimited capacity to issue currency in a crisis. In comparison, any dollar clearing house outside the US will always be more subject to crises of confidence – a problem with which even the eurozone has struggled.  Democrats and Republicans broadly agree about China, and there is little question that trade deglobalization undermines the dollar.

Chinese policymakers face many obstacles in trying to break away from the current renminbi peg. But, in characteristic style, they have slowly been laying the groundwork on many fronts. China has been gradually allowing foreign institutional investors to buy renminbi bonds, and in 2016, the International Monetary Fund added the renminbi to the basket of major currencies that determines the value of Special Drawing Rights (the IMF’s global reserve asset).

In addition, the People’s Bank of China is far ahead of other major central banks in developing a central-bank digital currency. Although currently purely for domestic use, the PBOC’s digital currency ultimately will facilitate the renminbi’s international use, especially in countries that gravitate toward China’s eventual currency bloc. This will give the Chinese government a window into digital renminbi users’ transactions, just as the current system gives the US a great deal of similar information.

Will other Asian countries indeed follow China? The US will certainly push hard to keep as many economies as possible orbiting around the dollar, but it will be an uphill battle. Just as the US eclipsed Britain at the end of the nineteenth century as the world’s largest trading country, China has surpassed America by the same measure.

The Chinese renminbi will not become the global currency overnight. Transitions from one dominant currency to another can take a long time. During the two decades between World Wars I and II, for example, the new entrant, the dollar, had roughly the same weight in central-bank reserves as the British pound, which had been the dominant global currency for more than a century following the Napoleonic Wars in the early 1800s.

So, what is wrong with three world currencies – the euro, the renminbi, and the dollar – sharing the spotlight? Nothing, except that neither markets nor policymakers seem remotely prepared for such a transition. US government borrowing rates would almost certainly be affected, though the really big impact might fall on corporate borrowers, especially small and medium-size firms.
Today, it seems to be an article of faith among US policymakers and many economists that the world’s appetite for dollar debt is virtually insatiable. But a modernization of China’s exchange-rate arrangements could deal the dollar’s status a painful blow. (The Guardian 4/3/21)
• (Kenneth Logoff is professor of economics and public policy at Harvard University. He was the chief economist of the International Monetary Fund from 2001 to 2003)