fixed vs floating exchange rate

Every country has to decide one big question about its money: should the exchange rate be left to wander wherever the market takes it, or should the government nail it to a fixed level? Think of two ways to set the temperature of a room. A floating rate is like leaving the window open — the temperature drifts up and down with the weather outside. A fixed rate is like a thermostat locked at one setting — the government works to hold the number steady no matter what. This choice is called the exchange-rate regime, and it is one of the most consequential decisions in macroeconomics.

Under a floating exchange rate, the price of the currency is set purely by supply and demand in the foreign exchange market, rising and falling freely from day to day; most large economies, including the United States, the euro area, Japan and Britain, float. Under a fixed exchange rate, the government commits to keep its currency at a chosen value against another currency (or a basket of them) and uses its reserves and interest rate to defend that promise — buying its own currency when it weakens and selling it when it strengthens. In between sit many hybrids, where a currency is mostly free but the central bank steps in occasionally. The pure cases are the textbook poles; reality is usually somewhere on the spectrum.

Each regime trades one good thing for another. Floating gives a country its own independent monetary policy — the central bank can cut rates to fight a recession — but the rate itself can be volatile and uncertain, complicating trade and investment. Fixing gives businesses and investors a stable, predictable rate, which can anchor inflation and encourage trade, but it ties the central bank's hands: it must defend the peg even when the economy would prefer different interest rates, and a fixed rate can collapse spectacularly if markets bet it cannot be held. There is no universally best choice — it depends on a country's size, openness, and credibility.