Floating Exchange Rate vs Fixed Exchange Rate
Floating Exchange Rate and Fixed Exchange Rate are two International Trade & Finance concepts in AP Economics that students often mix up. A floating exchange rate is determined freely by market supply and demand without government intervention. A fixed exchange rate is set and maintained by a government or central bank at a specific value against another currency. Here is how they compare side by side.
Most major currencies, such as the dollar and euro, float. Rates adjust automatically to trade and capital flows but can be volatile. It contrasts with a fixed exchange rate, which a government pegs.
The central bank buys or sells its currency and holds foreign reserves to defend the peg. It gives stability for trade but requires large reserves and limits independent monetary policy. Some countries have used fixed or managed exchange rates.
Floating vs Fixed Exchange Rates: What Adjusts
| Floating exchange rate | Fixed exchange rate | |
|---|---|---|
| Who sets the rate | Supply and demand in the foreign exchange market | The government or central bank, defending a target |
| What absorbs a shock | The exchange rate itself | Reserves first, then domestic prices and employment |
| Monetary policy independence | Retained | Surrendered, since policy must defend the peg |
| Reserves needed | None | Large, and they can run out |
| Trade certainty for firms | Lower, the rate moves | Higher, while the peg holds |
| Automatic trade rebalancing | Yes, via depreciation and appreciation | No, the rate cannot move to correct an imbalance |
| Failure mode | Volatility | A speculative attack that breaks the peg |
The trade-off is always the same one
Every exchange rate regime is choosing what adjusts when something goes wrong. Under a float, the exchange rate moves and the domestic economy is partly insulated: if exports collapse, the currency depreciates, which makes remaining exports more competitive and cushions the blow. Under a peg the exchange rate cannot move, so the adjustment has to happen somewhere else, through reserves, prices, wages, and employment. That is the whole comparison, and an answer built on it will address almost any question on the topic. Neither is better in the abstract; they distribute the pain differently.
Defending a peg costs reserves, and reserves are finite
To hold a currency above where the market would put it, a central bank must buy its own currency using foreign reserves, reducing supply on the market. That works only while reserves last, which is why speculative attacks succeed: if traders believe the reserves will run out, selling the currency becomes close to a one-way bet, and the selling itself drains the reserves faster. Holding a currency BELOW the market rate is easier and can persist, since a central bank can always print more of its own currency to buy foreign assets, which is why undervalued pegs last longer than overvalued ones. Exam questions usually describe reserves depleting, which points at an overvalued peg.
Why a peg means giving up monetary policy
This is the consequence students most often miss. If a central bank must keep the exchange rate at a target, its interest rate is no longer free. Cutting rates to fight a recession would drive capital out, weaken the currency, and break the peg, so it cannot cut. Raising rates to fight inflation would attract capital and strengthen the currency past the target, so it cannot raise. The rate is committed to the peg, and domestic stabilisation has to come from fiscal policy alone. A country cannot simultaneously have a fixed exchange rate, free capital movement, and an independent monetary policy; it must give one up. See /glossary/compare/fiscal-policy-vs-monetary-policy for what that leaves it with.
Frequently asked questions
What is the difference between a floating and a fixed exchange rate?
A floating rate is set by supply and demand in the foreign exchange market and moves freely. A fixed rate is held at a target by the central bank, which buys or sells its own currency using reserves to defend it. Under a float the exchange rate absorbs shocks; under a peg the domestic economy does.
Why do countries fix their exchange rate?
Mainly for certainty. A stable rate makes trade and foreign investment easier to plan, and importing a credible currency's stability can help a country with a history of high inflation anchor expectations. The cost is losing monetary policy independence and needing reserves to defend the peg.
What happens when a country cannot defend its peg?
Its reserves run down as it buys its own currency, and once markets expect the reserves to run out, selling accelerates. The central bank eventually gives way, either devaluing to a lower peg or abandoning the target altogether, and once the currency floats the market drives a sharp depreciation. This is why overvalued pegs are vulnerable to speculative attack in a way undervalued ones are not.
Live Exchange Rates graph. Drag the curves, or open the full version.
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