Demonstration article

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Exchange-rate regimes are among the most consequential and least discussed policy choices a country makes. They determine how a currency's value is set, what tools a central bank can use, and how shocks from abroad are transmitted to the domestic economy.

The spectrum of regimes

At one end sits a free float, in which the exchange rate is determined by markets and the central bank intervenes rarely, if at all. At the other are hard pegs: a currency board that backs every unit of domestic currency with foreign reserves, or the outright adoption of another country's currency. Between them lie many intermediate arrangements — conventional pegs that are defended but adjustable, crawling pegs that shift gradually, bands within which the currency can move, and managed floats in which authorities lean against sharp swings.

Each has merits. A fixed rate offers predictability for traders and investors and can import credibility from a more disciplined central bank, which is why it has often been used to bring down high inflation. A floating rate acts as a shock absorber: if demand for a country's exports falls, the currency can weaken, cushioning the blow to output and jobs.

A peg is a promise. Its strength depends on how much a country is willing to sacrifice to keep it.

The impossible trinity

Economists summarise the core constraint as the impossible trinity, or trilemma. A country cannot simultaneously maintain a fixed exchange rate, allow capital to flow freely across its borders and run an independent monetary policy. If capital is mobile and the rate is fixed, interest rates must track those of the anchor currency; otherwise money will flow in or out until the peg breaks. Countries that want both a peg and their own interest rates must restrict capital movements.

The trilemma: pick two

Fixed rate + free capital: monetary policy follows the anchor country.

Free capital + independent policy: the exchange rate must float.

Fixed rate + independent policy: capital controls are required.

This helps explain why pegs sometimes collapse dramatically. When markets doubt a government's willingness to raise interest rates or spend reserves to defend a currency, speculators can bet against it, draining reserves and making the doubt self-fulfilling. Hard pegs are harder to attack but leave no room to adjust when the domestic economy needs a different policy from the anchor.

Choosing in practice

The right regime depends on circumstances. Small economies that trade heavily with one large partner may benefit from pegging to that partner's currency. Countries with a history of high inflation may value the discipline of a fixed rate. Larger, more diversified economies with credible institutions tend to float. Many countries describe their regime one way and operate it another, intervening more than a pure float would imply — a habit some economists call a fear of floating. The choice is rarely permanent. Countries move along the spectrum as their economies, institutions and priorities change. What does not change is the underlying arithmetic of the trilemma, which every regime must respect.