Currency Peg

What Is a Currency Peg?

A currency peg is a policy in which a government or central bank fixes the value of its domestic currency against a foreign currency, a basket of currencies, or a commodity such as gold. Instead of letting the price of its money move freely with supply and demand, the authority commits to keep the exchange rate at or near a set level.

How a Currency Peg Works

To hold the rate steady, the central bank must buy or sell its own currency in the foreign exchange market. If demand for the domestic currency rises and pushes it above the peg, the bank issues and sells more of its currency. If it falls below the peg, the bank uses its foreign exchange reserves to buy its own currency back. Over time, the peg constrains monetary policy, because domestic interest rates often must move in line with the anchor currency's rates rather than purely to meet domestic goals.

Pegs vary in strictness. A currency board legally requires the domestic money supply to be fully backed by foreign reserves at a fixed rate. Looser arrangements allow the rate to move within a narrow band around a central value.

Advantages and Risks

Pegs can bring stability. Businesses that trade internationally face less uncertainty about future exchange rates, and a peg to a low-inflation currency can help anchor expectations about prices.

The risks are real. Maintaining a peg requires large reserves and credible policy. When markets doubt a government can defend the rate, speculators may sell the currency heavily, forcing a sudden devaluation or an abandonment of the peg. Such episodes have caused sharp economic disruption in several countries.

Why It Matters to Investors

For investors, a peg can affect returns on assets denominated in the local currency, the cost of borrowing, and the risk of sudden market moves. A country with a credible peg may see steadier bond yields, while one under pressure may experience sharp currency losses. Investors often watch reserve levels and policy announcements for signs of strain. A peg differs from a floating exchange rate, where market forces set the price.