What Was the Bretton Woods System? Origins of the IMF and World Bank

Search Fintrev

Search our guides, reviews and glossary.

The Bretton Woods system was the international monetary order agreed in July 1944. Member countries fixed their currencies to the U.S. dollar within narrow bands, and the United States promised to convert dollars held by foreign governments and central banks into gold at $35 per ounce. The Bretton Woods agreement also created the International Monetary Fund (IMF) and the World Bank. The exchange rate system ended in the early 1970s, but both institutions still operate.

How the Bretton Woods System Worked

The system had three tiers. Gold sat at the top, the dollar in the middle, and every other member currency at the bottom.

1. Gold to dollar. The U.S. Treasury fixed the dollar at $35 per troy ounce. Foreign central banks and governments could present dollars and receive gold at that price. Private individuals did not have this right.
2. Dollar to other currencies. Each member declared a par value for its currency in dollars (formally in gold or dollars). The market rate was allowed to move only 1% either side of that par value.
3. Intervention. When the market rate approached the edge of the band, the country’s central bank stepped in. To support a weak currency it sold dollars from its reserves and bought its own currency. To hold down a strong currency it did the opposite.

The pegs were fixed but adjustable. A country facing a “fundamental disequilibrium,” a persistent imbalance in its external accounts, could change its par value after consulting the IMF. Short-term pressure was meant to be met with reserves or IMF loans, not devaluation. Many countries also kept capital controls. These limited the flows of speculative money that could otherwise overwhelm a fixed rate.

The arrangement took years to function as designed. Most European currencies did not become freely convertible for trade purposes until 1958, so the full system ran for little more than a decade.

Example: A Hypothetical Peg in Practice

This is a hypothetical example for illustration, not a historical rate.

Suppose Country A sets its par value at 4.00 units of its currency per U.S. dollar.

• Permitted band: 1% either side gives a floor of 3.96 and a ceiling of 4.04 units per dollar.
• Implied gold price: with gold at $35 an ounce, one ounce costs 35 × 4.00 = 140 units of Country A’s currency.
• Defending the peg: imports surge and traders sell Country A’s currency, pushing the rate toward 4.04. The central bank sells dollars from its reserves and buys back its own currency until the rate moves back inside the band.
• When reserves run low: Country A can borrow from the IMF to keep intervening. If the imbalance proves lasting, it can devalue, for instance to a new par of 4.40 per dollar, with the band recalculated around the new figure.

The Bretton Woods Conference

The United Nations Monetary and Financial Conference met at Bretton Woods, New Hampshire, in July 1944. Roughly 730 delegates from 44 countries attended. The meeting lasted about three weeks, but British and American officials had been preparing plans for several years. Their goals were to build an efficient foreign exchange system, prevent the competitive devaluations and trade barriers of the 1930s, and support postwar growth.

The two principal designers took different positions. John Maynard Keynes, the British economist, proposed an International Clearing Union. This would be a powerful global central bank that issued a new reserve currency called the bancor. Harry Dexter White of the U.S. Treasury proposed a more modest lending fund and a central role for the dollar instead of a new currency. The final agreement borrowed from both plans but leaned toward White’s. No international currency resulted from the conference. The dollar filled that role.

The Bretton Woods Institutions: IMF and World Bank

The agreement created two organizations, formally established in December 1945.

• The International Monetary Fund monitored exchange rates, approved par value changes and lent to members with balance of payments problems, so they could hold their pegs without drastic measures. Today it has about 190 member countries and works on global monetary cooperation, surveillance and crisis lending.
• The World Bank, originally the International Bank for Reconstruction and Development, financed rebuilding in countries devastated by World War II. Its focus later shifted to loans and grants for development in lower- and middle-income countries.

Why It Mattered

Fixed exchange rates gave exporters, importers and lenders predictable conversion rates for trade in goods and services and for cross-border financing. Exchange rate volatility among members stayed low, and this stability also supported international lending, including World Bank loans. The system ran alongside the reconstruction of Europe and Japan and the expansion of world trade in the postwar decades.

Bretton Woods also made the dollar the main reserve currency. Central banks held dollars as their primary reserve asset, and much international trade and borrowing was priced in dollars. That position outlasted the gold link. Debates about reducing reliance on the dollar, such as those surrounding BRICS, still respond to it.

Limitations and Collapse

The system’s weaknesses were structural.

The Triffin dilemma. Economist Robert Triffin pointed out that the world needed a growing supply of dollars as reserves, and the United States could only supply them by running external deficits. The more dollars piled up abroad, the less plausible it became that the U.S. could redeem them all in gold at $35. The system’s growth undermined its own anchor.

Asymmetric adjustment. Deficit countries faced pressure to devalue or tighten policy when reserves ran down. Surplus countries faced no equivalent pressure to revalue. Par value changes were often delayed until they could no longer be avoided, which invited speculation.

U.S. policy and inflation. During the 1960s, U.S. spending and rising inflation weakened confidence in the dollar. Foreign holders converted dollars into gold, and U.S. gold reserves fell. Central banks tried to hold the market price of gold at $35 through a joint arrangement known as the London Gold Pool, which broke down in 1968.

The end. On August 15, 1971, Nixon announced that the United States would temporarily suspend the dollar’s convertibility into gold. The decision came after a run on U.S. gold reserves and amid concern that the gold supply could no longer cover the dollars in circulation. The Smithsonian Agreement in December 1971 tried to rescue the system. It devalued the dollar to $38 per ounce of gold and widened the bands. A further devaluation followed in early 1973. By March 1973 the major currencies were floating. The 1976 Jamaica Accords amended the IMF’s rules to recognize floating rates. Countries could choose any arrangement except pegging to gold, including a peg to another currency or a basket, or a free float.

Bretton Woods vs. the Gold Standard

The two are often treated as the same thing, but they worked differently.

• Classical gold standard: each participating currency was defined directly as a weight of gold. Banknotes were generally convertible into gold, and gold flows between countries did much of the adjusting.
• Bretton Woods: only the dollar was tied to gold, and only foreign official holders could convert. Other currencies linked to gold indirectly through their dollar pegs, and those pegs could be adjusted with IMF approval.

Bretton Woods is often described as a gold exchange standard. Gold anchored the system at one point, the dollar, and everyone else used dollars as their working reserve.

Is Bretton Woods Still in Effect?

No. The exchange rate system ended between 1971 and 1973. Major currencies now float against each other, while some countries still peg to the dollar, the euro or a basket under their own policies, not under a global agreement.

The dollar is no longer backed by gold. It is fiat money, and its value rests on the U.S. government’s ability to tax and generate revenue and on confidence in U.S. institutions. Without a gold anchor, the dollar’s purchasing power depends on monetary policy.

The Bottom Line

Bretton Woods matters to anyone trying to understand why the dollar remains the main reserve currency and why the IMF and World Bank exist. Its fixed but adjustable pegs gave trade and lending predictable rates for about a decade of full operation. The Triffin dilemma, lopsided adjustment and U.S. inflation eventually broke the gold link, leaving today's floating rates and a fiat dollar whose value depends on monetary policy.