Floating vs Fixed Exchange Rates: How Currency Regimes Work

A floating exchange rate is one that is set by supply and demand in the currency market, with no official target. A fixed exchange rate is one the government or central bank commits to holding at, or close to, a chosen level against another currency or a basket. Between those two poles sit managed floats and crawling pegs. The choice of regime shapes how much a currency moves from day to day and what tools a country gives up or keeps.

How a floating rate works

Under a free float, the price of a currency is simply whatever buyers and sellers agree on at a given moment. Importers needing foreign currency, exporters converting their earnings, investors moving money between countries and speculators all add to the flow. The US dollar, the euro, the Japanese yen and the British pound are examples of currencies that float.

A floating currency can still be influenced by the central bank, mainly through interest rates, but there is no promise to keep it at any particular level. The forces behind those daily moves are covered in the guide to what affects exchange rates.

Strengths of a float

• The exchange rate can absorb economic shocks, for example by weakening when export demand falls.
• The central bank is free to set interest rates for domestic goals such as inflation.
• There is no need to hold large reserves to defend a target.

Weaknesses of a float

• Businesses face uncertainty about the value of future foreign payments and receipts.
• Rates can overshoot, moving further than economic fundamentals seem to justify.
• Smaller economies can see sharp swings when global investors change their minds.

How a fixed rate or peg works

With a fixed rate, the authorities announce a target, often against the US dollar or the euro, and stand ready to buy or sell their own currency to keep the market price there. If the home currency comes under selling pressure, the central bank buys it using its foreign-currency reserves. If it comes under buying pressure, the bank sells it and adds to reserves.

Real-world examples include the Hong Kong dollar, which is linked to the US dollar within a narrow band, several Gulf currencies tied to the dollar, and the Danish krone, which is held close to the euro. In each case the peg is a policy commitment rather than a law of nature.

What a peg costs

Holding a peg usually means interest rates must broadly follow those of the anchor currency. If they drifted far apart, money would flow towards the higher rate and put the peg under strain, a pressure related to the logic behind the carry trade. The country therefore gives up much of its independent monetary policy in exchange for exchange-rate stability.

When pegs break

A peg is only as credible as the reserves and political will behind it. When markets doubt that a central bank can keep defending its target, selling can accelerate, and a currency that has been stable for years can drop sharply in a single day once the target is abandoned. Removing a cap or floor can be just as abrupt: when the Swiss National Bank ended its minimum exchange rate against the euro in 2015, the franc jumped within minutes.

The regimes in between

Regime	How it works	Typical trade-off
Free float	Market sets the rate; no target	Policy freedom, more volatility
Managed float	Market sets the rate, but the central bank intervenes to smooth sharp moves	Some stability, less transparency
Crawling peg	Target adjusted in small, regular steps	Gradual change, ongoing reserve use
Band	Rate allowed to move within a set range	Limited flexibility, defined limits
Hard peg / currency board	Fixed rate backed fully by foreign reserves	High credibility, little policy room
Currency union or dollarisation	Country uses a shared or foreign currency	No exchange rate with the anchor at all

Many economies describe themselves as floating while intervening from time to time, so the official label and the day-to-day reality do not always match.

A short history

For roughly a quarter of a century after the Second World War, major currencies were tied to the US dollar under the Bretton Woods system, and the dollar was in turn linked to gold. That arrangement broke down in the early 1970s, and the large economies moved to floating rates. Since then, countries have chosen regimes to suit their circumstances, and some have switched more than once.

What the regime means in practice

For a traveller or a business, a pegged currency usually means predictable conversion costs, with the small risk of a sudden one-off adjustment. A floating currency means continuous small changes that add up over months. For anyone reading financial news, knowing the regime explains why one central bank talks about inflation and interest rates while another talks about reserves and the defence of a target. How rate decisions feed through to floating currencies is covered in the explainer on interest rates and exchange rates.

Frequently asked questions

Is a fixed exchange rate better than a floating one?

Neither is better in general. Fixed rates suit some small, trade-dependent economies that value stability; floating rates suit large economies that want to run their own monetary policy.

Can a floating currency become pegged?

Yes. Governments can adopt a peg, and pegged currencies can be allowed to float. Such changes are usually major policy events.

Educational background on how currency systems are organised. It is not a forecast or investment advice; for decisions involving foreign-currency money, consult a qualified adviser.