A reserve currency is a widely accepted foreign currency that central banks accumulate to settle international transactions, pay for imports (especially commodities like oil), service foreign-denominated debt, and intervene in currency markets to stabilize their own exchange rate. To function as one, a currency must be liquid, convertible, backed by deep and trusted financial markets, and issued by a state with credible institutions and rule of law.
The IMF tracks the composition of global reserves through its COFER database (Currency Composition of Official Foreign Exchange Reserves). As of recent COFER data, the U.S. dollar accounts for roughly 58–59% of allocated global reserves, followed by the euro (~20%), the Japanese yen, pound sterling, Chinese renminbi, Canadian dollar, Australian dollar, and Swiss franc.
Historically, reserve-currency status has shifted with geopolitical power. The Dutch guilder dominated in the 17th century, sterling in the 19th and early 20th, and the dollar after the 1944 Bretton Woods Conference, which pegged other currencies to the dollar and the dollar to gold. President Nixon's 1971 suspension of dollar–gold convertibility ended Bretton Woods but did not displace the dollar, which retained its role through the depth of U.S. Treasury markets and the petrodollar system.
Reserve-currency status confers what former French finance minister Valéry Giscard d'Estaing called an "exorbitant privilege": the issuer can borrow cheaply in its own currency, run persistent current-account deficits, and project financial power through sanctions, as seen with U.S. measures against Iran and Russia. It also creates the Triffin dilemma — the tension between supplying global liquidity and maintaining domestic monetary discipline.
The IMF's Special Drawing Right (SDR), created in 1969, is a reserve asset (not a currency) whose value is based on a basket of the dollar, euro, renminbi, yen, and sterling. Debates over "de-dollarization," BRICS settlement arrangements, and renminbi internationalization continue, though no challenger currently matches the dollar's depth.
Example
In 2016 the IMF added the Chinese renminbi to the SDR basket, formally recognizing it as a reserve currency alongside the U.S. dollar, euro, yen, and pound sterling.
Frequently asked questions
The U.S. dollar, holding roughly 58–59% of allocated official reserves according to recent IMF COFER data, followed by the euro at about 20%.
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