Fixed Exchange Rate

A fixed exchange rate is a currency regime in which a government or central bank officially ties the value of its domestic currency to another currency, a basket of currencies, or a commodity such as gold. The peg is maintained through active intervention in the foreign‑exchange market, buying or selling reserves to keep the market rate within a narrow band around the announced parity. This system contrasts with floating rates, where market forces alone determine the currency’s value.

How It Works

The authority sets a target parity, for example, 1 unit of local currency equals 0.5 units of a foreign anchor currency. To uphold this rate, the central bank monitors the spot market. If demand for the local currency pushes its value above the peg, the bank sells its own currency and buys foreign reserves, increasing supply and pulling the rate down. Conversely, if the local currency depreciates beyond the band, the bank buys back its currency using reserves, reducing supply and supporting the peg. Some regimes allow a limited fluctuation band (e.g., ±1 %) before intervention triggers.

Why It Matters

Fixed exchange rates reduce currency risk for importers, exporters, and foreign investors, encouraging trade and cross‑border capital flows by providing predictable pricing. For emerging economies, a credible peg can help anchor inflation expectations and stabilize the macro‑environment. However, maintaining the peg requires substantial foreign‑exchange reserves and can limit monetary policy independence; if reserves are depleted, the country may be forced to devalue or abandon the fix. A classic example is the Hong Kong dollar’s link to the U.S. dollar since 1983, which has supported the territory’s status as a global financial hub while requiring the Hong Kong Monetary Authority to adjust interest rates in line with U.S. policy to defend the peg.