A pegged exchange rate is a fixed exchange rate set and maintained by a central bank, where one currency is tied to another, typically the US dollar or euro. Unlike floating rates determined by supply and demand, a pegged exchange rate does not change unless the central bank deliberately adjusts or removes the peg.
Benefits of Pegged Exchange Rates
Pegging provides stability: importers and exporters know the exchange rate months or years ahead, reducing uncertainty and transaction costs in international trade. Investors are more willing to put money in a country if they do not fear sudden currency devaluation. A pegged rate signals monetary discipline and can help control inflation.
Constraints and Risks
Pegging has significant constraints. A central bank defending a peg must hold large foreign exchange reserves to buy or sell its own currency if demand pushes it away from the peg. This ties up capital and leaves the country vulnerable to speculative attacks: if traders bet the peg will break, a sudden wave of selling can drain reserves in hours, forcing a devaluation.
Pegging also limits monetary policy. To maintain the peg, a central bank often cannot cut interest rates independently when its economy needs stimulus, as lower rates would weaken the currency and undermine the peg.
When Pegs Fail
A pegged rate system works best when inflation stays near the peg partner's level and external shocks are mild. If inflation diverges sharply or a major crisis hits, the peg becomes unsustainable and breaks, often causing sharp losses for traders holding that currency. For forex traders, pegged currencies are relatively predictable until the moment they are not—the real risk lies in recognizing when a peg is about to fail.
