A fixed exchange rate is a government or central-bank commitment to keep a currency’s value at a set rate—or within a defined band—against another currency or a basket of currencies. It can make exchange rates more predictable, but maintaining the commitment limits monetary-policy flexibility and can shift the burden of economic adjustment onto domestic prices, wages, output and employment.
What a fixed exchange rate means
A fixed exchange rate, often called a peg, is a policy arrangement: the authorities state that they will maintain a particular relationship between their currency and an anchor currency or basket. A currency that has merely moved very little is not necessarily pegged; the commitment and the policy used to support it matter.
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Fixed arrangements are not all equally strict. Some hold a rate tightly, while others allow a band, gradual movement or occasional adjustment. The International Monetary Fund describes exchange-rate regimes as a continuum rather than a simple fixed-versus-floating choice. A regime can also be classified by its official commitment (de jure) or by how the currency behaves in practice (de facto), and those classifications may differ. IMF, “Back to Basics: Exchange Rate Regimes,” March 2008
How a central bank maintains a peg
To defend a target, a central bank can buy or sell currencies in the foreign-exchange market, manage its foreign-exchange reserves and adjust domestic liquidity or interest-rate conditions. If market pressure pushes the currency away from the target, intervention and supporting policy may be needed to keep it there. The ability to do this credibly depends on the authorities’ policies, market confidence and capacity to intervene.
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A currency board is a particularly rigid form of fixed exchange rate. The issuing authority commits to exchange monetary liabilities at a fixed rate and backs them with foreign assets. That rule can strengthen confidence, but leaves little room for discretionary monetary policy and can constrain emergency support to banks. Sound banking and prudent fiscal policy are especially important under such an arrangement. IMF, “Currency Boards,” March 2000
Advantages and disadvantages of a fixed exchange rate
| Issue | Potential advantage | Cost or limitation |
|---|---|---|
| Trade and planning | A more predictable rate against the anchor can make prices, contracts and cross-border planning easier. | Stability against one anchor does not stabilize the currency against every other currency or guarantee stable prices at home. |
| Inflation expectations | A credible peg can provide a visible nominal anchor and encourage policy discipline. | It does not guarantee low inflation. Inconsistent policy or repeated changes to the target can undermine credibility. |
| Monetary policy | Linking to a larger currency can import some of its credibility and connect domestic financial conditions to the anchor. | Authorities have less room to set interest rates and monetary policy for local economic conditions. |
| Economic adjustment | A stable nominal exchange rate removes one source of uncertainty. | Without nominal depreciation or appreciation, shocks may be absorbed through domestic prices, wages, output and employment instead. |
| Currency board | Strict rules and foreign-asset backing can make the commitment more credible. | Reserve backing, banking resilience and fiscal prudence are crucial; the authority has less flexibility to support banks or government financing. |
A peg’s practical value therefore depends on more than its announced rate. When comparing arrangements, consider what is being targeted, how much adjustment is allowed, whether redemption or reserve backing is promised, how much monetary independence remains, and whether the economy can absorb shocks through wages, prices, employment or fiscal policy.
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What historical data says—and does not say
An IMF overview published in 1996 reported average annual inflation of 8% in its sample of countries with pegged exchange rates, compared with 14% under intermediate regimes and 16% under floating regimes. The overview examined observations across 145 countries over 30 years; these are historical sample averages, not current inflation rates or a guarantee that a peg will lower inflation. The same analysis reported average annual per-capita GDP growth of 1.6% across the sample and slightly faster growth under floating regimes overall, despite higher investment under pegs. These comparisons describe associations in that historical sample; they do not establish that the exchange-rate regime alone caused the outcomes. IMF, “Does the Exchange Rate Regime Matter for Inflation and Growth?” March 1996
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Examples of fixed exchange rates
UAE dirham and the US dollar
The Central Bank of the UAE says it intervenes automatically in the foreign-exchange market to maintain the dirham’s peg to the US dollar. Its published intervention rates are USD/AED 3.672 when buying dollars and USD/AED 3.673 when selling dollars. These are central-bank intervention rates, not a promise of the retail conversion rate a traveler or business will receive. Central Bank of the UAE, Domestic Market Operations (accessed October 8, 2026).
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Historical currency-board examples
An IMF chapter published in 2000 named Djibouti, Brunei Darussalam, Hong Kong SAR, Argentina, Estonia, Lithuania, Bulgaria, and Bosnia and Herzegovina as examples of currency boards. This is a historical list from that publication, not a statement that every listed arrangement remains in force today. IMF, “Currency Boards,” March 2000
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What to remember when evaluating a peg
- Check whether the arrangement is a firm peg, a band, a crawling arrangement or an adjustable peg; the label alone does not reveal how much movement is allowed.
- Distinguish the official commitment from the currency’s observed behavior.
- Ask what reserves, intervention capacity and supporting policies sustain the target.
- Consider whether the economy can absorb shocks without changing the nominal exchange rate.
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