Triffin Dilemma
a.k.a. Triffin paradox
The conflict a reserve-currency country faces: the world needs its currency, so it must run deficits, which slowly undermines trust in that currency.
The Triffin dilemma, named after economist Robert Triffin, describes a trap. If the whole world wants to hold your currency as a reserve, you have to supply it, which usually means running big current account deficits. But persistent deficits and growing debts can eventually make people doubt the currency's value.
Triffin warned about this in the 1960s, and the Bretton Woods system broke down in 1971. Today, the same argument is used in debates about the US dollar and de-dollarization.
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