What Is a Currency Peg?
Learn how currency pegs fix a local currency's value to a foreign currency and why central banks maintain or abandon them.
Key Takeaways
- A currency peg fixes a local currency's exchange rate to a foreign currency or basket of currencies at a set ratio.
- Central banks maintain pegs by buying or selling foreign reserves to counteract market forces that would move the rate.
- Pegs provide exchange rate stability but require large reserves and limit monetary policy independence.
What a Currency Peg Is
A currency peg, or fixed exchange rate, is a policy where a country's central bank maintains its currency's value at a fixed ratio to another currency or basket of currencies. The Hong Kong dollar has been pegged to the US dollar at approximately 7.8 since 1983. The CFA franc used across 14 West and Central African countries is pegged to the euro. Unlike a free-floating currency, which fluctuates based on market supply and demand, a pegged currency's rate is set and defended by central bank intervention.
How Pegs Are Maintained
Central banks maintain pegs by intervening in foreign exchange markets. If market forces push the currency below the pegged rate, the central bank sells foreign reserves to buy its own currency, supporting the price. If the currency appreciates above the peg, the central bank buys foreign currency, building reserves. This requires substantial foreign exchange reserves. Some countries use capital controls to limit market forces on the currency. Crawling pegs allow gradual, pre-announced adjustments to account for inflation differences between the two economies.
Advantages and Disadvantages
Pegs provide exchange rate predictability, facilitating trade and investment planning. They anchor inflation expectations by importing the monetary credibility of the reference currency. For the CFA franc zone, the euro peg has delivered decades of relative price stability. However, pegs constrain monetary policy: interest rates must follow the reference country. Overvalued pegs damage export competitiveness, and defending a peg under market pressure can rapidly deplete reserves, as Nigeria experienced before allowing the naira to float more freely.
Currency Pegs in Africa
The CFA franc zone is Africa's most prominent currency peg, covering countries from Senegal to Cameroon. While it provides stability, critics argue the peg overvalues the CFA franc relative to African economic fundamentals, harming export competitiveness. Botswana uses a crawling peg against a basket weighted toward the South African rand and IMF Special Drawing Rights. Eritrea maintains a fixed rate for the nakfa. Egypt operated a de facto peg before multiple devaluations in 2022-2024. African businesses must monitor peg sustainability, as sudden adjustments create significant commercial disruption.