Triffin Dilemma: Reserve Currency Simulator

Reserve-Currency Policy

Deficit constraint 30% 0% = supply whatever deficit the world demands. 100% = cap deficits hard to protect confidence.

Global trade growth 4.0%/yr Faster world trade growth → faster-growing demand for reserve-currency liquidity.

Simulation speed 1×

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World reserve demand

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Deficit this period

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External debt stock

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Liquidity shortfall

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Confidence index–

■ Debt/threshold■ Confidence

Sim year

World trade volume

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The Triffin Dilemma

When one country's currency becomes the world's dominant reserve currency, the rest of the world needs a growing supply of it to conduct trade and hold as reserves as the global economy expands. The only way that currency reaches the rest of the world in sufficient quantity is for the issuing country to run persistent trade/current-account deficits, exporting its own currency abroad.

But large, sustained deficits and a growing pile of external debt are exactly the kind of signal that erodes confidence in a currency's long-term stability — and it's confidence in that stability that made everyone want to hold the currency as a reserve in the first place.

Deficit constraint low — the country accommodates world demand for liquidity in full. Debt climbs steadily and, once it passes the sustainability threshold, the confidence index decays.

Deficit constraint high — external debt stays low and confidence holds, but the world doesn't get the reserve-currency liquidity it needs, so a liquidity shortfall builds up and drags on global trade growth instead.

If confidence collapses below a critical level, a self-reinforcing "confidence crisis" fires: capital flight forces an abrupt deficit cut, independent of the policy slider — a simplified stand-in for a real reserve-currency confidence crisis.

Reserve-currency country Rest-of-world economies Outbound currency flow Confidence crisis

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