How does a pegged exchange-rate arrangement work?

In a pegged exchange-rate arrangement, a country’s monetary authorities pledge to tie the value of their currency to another currency or a specific group of currencies. This mechanism is designed to maintain stability in international trade by providing a predictable pattern of exchange rates.12

To ensure the currency remains within the agreed-upon limits, monetary authorities actively intervene in the foreign exchange market. For example, if a country’s currency faces downward pressure, the authorities may supply the foreign currency to which it is pegged—often referred to as an "intervention" currency—to prevent the exchange rate from exceeding the established threshold.3

While this system provides stability, it requires authorities to manage reserves to support these interventions. Historically, the International Monetary Fund supervised a system where members pegged their currencies to the U.S. dollar, which was in turn tied to gold. Today, countries may choose from various arrangements, including pegged or fixed systems, depending on their economic policy goals.31