The Basics
- Simple definition: The contradiction at the heart of the Bretton Woods system where the country whose currency serves as the global reserve must run deficits to supply liquidity, but persistent deficits undermine confidence in that currency.
- Core idea: The reserve currency country cannot win because supplying enough currency causes confidence to collapse, while maintaining confidence causes global liquidity to dry up.
- Think of it as: The tragic flaw of having your currency serve as the world’s money.
What It Actually Means
Belgian economist Robert Triffin identified that for world trade to grow, the United States must supply dollars, which means running balance of payments deficits and sending dollars abroad. However, accumulating dollar holdings abroad eventually exceeds US gold reserves, raising doubts about the dollar’s gold convertibility. If the US stopped deficits, the world would lack liquidity. If it continued to have deficits, confidence would collapse. This is exactly what happened and led to the Bretton Woods collapse in 1971. The dilemma remains because the dollar is still the reserve currency, so US deficits fund the world but raise long-term sustainability questions.
Example
In the 1960s, the United States ran deficits to fund the Vietnam War and Great Society programs, sending dollars abroad. Foreign dollar holdings grew beyond US gold reserves. France’s de Gaulle demanded gold, exposing the dilemma. Nixon closed the gold window in 1971.
Why It Matters (2026)
The Triffin dilemma applies to any reserve currency. As China promotes yuan internationalization, it would face the same dilemma. The dollar’s role persists despite debates about alternatives.
See also
Bretton Woods System • Reserve Currency • Exorbitant Privilege • Balance of Payments • SDR
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