Why the dollar's reserve-currency status persists
Reserve currency status survives long after the issuer's economic share has fallen. The reason is liquidity and habit, not strength.
Key fact
USD share of global FX reserves: ~59% (IMF COFER, Q4 2023)
The dollar's share of global reserves has slipped from 71% in 1999 to roughly 59% today. Coverage of this trend often reads as a countdown. It is not. A reserve currency is a coordination equilibrium, and coordination equilibria are sticky in ways that bilateral trade flows are not.
Consider what a central bank wants from reserves. It wants liquid assets it can sell quickly to intervene in currency markets. It wants settlement-grade money it can use to pay for emergency imports of food, fuel, or pharmaceuticals. It wants a counterparty universe deep enough that a $10 billion sale does not move the market against it.
The dollar meets all three tests. Treasury markets clear trillions of dollars per day. Almost every major commodity is priced in USD. Correspondent banking infrastructure runs through dollar clearing. No competing currency offers comparable depth on any of those dimensions.
The euro is the closest competitor. Eurozone bond markets are large but fragmented across 20 sovereign issuers with different credit quality. A 10-year German bund and a 10-year Italian BTP are not interchangeable, so the market is shallower than its nominal size suggests. The European Central Bank has occasionally proposed a true common euro-denominated safe asset; political consensus for that has not materialized.
The renminbi is large by GDP but inaccessible by capital account. China has not removed its capital controls and shows no intention of doing so soon. A reserve currency requires that foreign central banks can move money in and out at scale on short notice. That requirement is incompatible with the macroeconomic management style Beijing has chosen.
Gold is interesting. Central banks have been accumulating gold at the fastest pace in decades, particularly in non-Western economies. Gold diversifies away from any single sovereign's policy choices. But gold cannot settle a trade invoice, cannot pay a wire instruction, and earns no yield. It is a reserve for catastrophe, not a working medium.
The Japanese yen and the Swiss franc occupy a distinct niche. Both are safe-haven currencies that appreciate during global risk-off episodes. Both have free capital accounts, deep bond markets, and credible central banks. Neither, however, carries trade-invoicing weight comparable to the dollar or even the euro, in part because Japan's and Switzerland's domestic markets are too small to absorb the foreign demand a major reserve role would generate. They serve as portfolio diversifiers rather than primary reserve assets.
Privately issued digital currencies and stablecoins enter this discussion at the margin. Dollar-backed stablecoins have become non-trivial holders of US Treasury bills, and their cross-border settlement role is growing in remittance corridors and in trade between counterparties wary of correspondent banking. They are not reserves in the central-bank sense, but they extend dollar usage into channels where traditional dollar settlement would be costly. Regulators in major jurisdictions are still working out how to treat them.
So what does slow erosion actually look like? It looks like the share of reserves held in a broader basket of currencies rising — the Australian and Canadian dollars, the Korean won, the Singapore dollar. Each of those gains a few tenths of a percentage point. The dollar's share continues to slide gently. Nothing replaces it; many somethings share its role.
Two further dynamics deserve attention. First, central-bank behavior in foreign-asset choice is influenced not only by yield and liquidity but by perceptions of weaponization risk. Reserve managers in countries that fear being sanctioned have an incentive to diversify away from dollar holdings even when diversification is more expensive. That incentive has grown since 2022. The dollar's share will fall a bit faster because of it, even though dollar fundamentals remain attractive on every other metric.
Second, the relationship between reserve currency status and issuer fiscal discipline has been a recurring debate. Some argue that the dollar's reserve role permits the United States to run larger deficits than other countries could sustain, because foreign demand for dollar assets absorbs the borrowing. Others argue that fiscal indiscipline eventually erodes the currency's appeal regardless of network effects. Both effects are real, and the empirical question is at what fiscal trajectory the second one starts to dominate the first. There is no clean answer yet.
That is a different world from the one most commentary imagines. In the imagined world, the dollar collapses and a competitor rises. In the actual world, the dollar's centrality dilutes slowly and the global reserve system becomes more polycentric without crowning a successor. Policy needs to be calibrated to the actual world.