fixed exchange rate
US /ˌfɪkst ɪksˈtʃeɪndʒ reɪt/
UK /ˌfɪkst ɪksˈtʃeɪndʒ reɪt/

1.
taux de change fixe
a type of exchange rate regime where a currency's value is fixed against the value of another single currency, a basket of other currencies, or a unit of account
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Many countries abandoned the fixed exchange rate system in favor of floating rates.
De nombreux pays ont abandonné le système de taux de change fixe au profit des taux flottants.
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A fixed exchange rate can provide stability for international trade.
Un taux de change fixe peut apporter de la stabilité au commerce international.