Metallic money

After Bretton Woods
This breakdown of the fixed exchange rate system ended each country’s obligation to maintain a fixed price for its currency against gold or other currencies. Under Bretton Woods, countries had bought when the exchange rate fell and sold when it rose; now national currencies floated, meaning that the exchange rate rose or fell with market demand. If the exchange rate appreciated, buyers received fewer units of domestic money in exchange for a unit of their own currency. Purchasers of domestic goods and assets then faced higher prices. Conversely, if the currency depreciated, domestic goods and assets became cheaper for foreigners. Countries that were heavily dependent on foreign trade disliked the frequent changes in price and costs under the new floating rates. Governments or their central banks often intervened to slow nominal (market) exchange rate changes. Historically, however, these interventions have been effective only against temporary changes.
In the long run, a country’s exchange rate depends on such fundamental factors as relative productivity growth, opportunities for investment, the public’s willingness to save, and monetary and fiscal policies. These fundamental factors are at work whether the country has a fixed or a floating exchange rate and whether the authorities intervene to adjust the exchange rate or slow its changes. As long as markets for goods, services, assets, and foreign exchange remain open, the country must adjust.

The principal difference between fixed and floating exchange rates is how the country adjusts. With fixed exchange rates, adjustment occurs mainly by changing costs and prices of the myriad commodities that a country produces and consumes. Under floating exchange rates, the adjustment occurs mainly by changing the nominal exchange rate. For example, if Brazil’s monetary policy increases Brazilian inflation, domestic prices of shoes, cocoa, and almost everything else will rise. With a fixed exchange rate, the price rise deters exports and purchases by foreigners. Demand shifts from Brazil to other countries, lowering demand and reducing payments for Brazilian products. This decreases Brazil’s money stock. The reduction in money and the fall in demand slow the Brazilian economy, thereby reducing Brazilian prices. With a floating exchange rate, however, the adjustment comes about by reducing the demand for Brazilian currency and depreciating the exchange rate, thereby reducing the prices paid by foreigners.
Adjustment comes in many other ways. In this hypothetical example, Brazilians may decide to invest more abroad, or foreigners may decide to invest less in Brazil. The long-run outcome will be the same, however, because buyers and sellers do not care about the nominal exchange rate (the official rate set by national governments under a fixed exchange rate or set by the market under floating rates). What matters is the so-called real exchange rate—the nominal exchange rate adjusted by prices at home and abroad. The buyer of Brazilian shoes in England cares only about the cost of the shoes in local currency—that is, British pounds. The Brazilian price of shoes is multiplied by the exchange rate to get the U.K. price. Under floating exchange rates, the exchange rate adjusts to keep a country’s commodities competitive on the world market.
After the Bretton Woods system ended in 1973, most countries allowed their currencies to float, but this situation soon changed. Generally, small countries with relatively large trade sectors disliked floating rates. They wanted to avoid the often transitory but sometimes large changes in prices and costs arising in the foreign exchange market. Many of the smaller Asian economies, along with countries in Central America and the Caribbean, fixed their exchange rates to the U.S. dollar. Countries such as the Netherlands and Austria, both of which traded heavily with West Germany, soon fixed their exchange rates to the German mark. These countries ceased conducting independent central bank policy, so that when the Bundesbank or the U.S. Federal Reserve changed interest rates, countries that fixed their exchange rate to the mark or the dollar changed their interest rates as well.
A country on a fixed exchange rate sacrifices independent monetary policy. In some cases this may be a necessary sacrifice, because a small country that is open to external trade has little scope for independent monetary policy. It cannot influence most of the prices at which its citizens buy and sell. If its central bank or government inflates, its currency depreciates to bring its domestic prices back to equivalent world market levels. Even a large country cannot maintain an independent monetary policy if its exchange rate is fixed and its capital market remains open to inflows and outflows. Given the reduced reliance on capital controls, many countries abandoned fixed exchange rates in the 1980s as a means of preserving some power over domestic monetary policy. This trend reversed somewhat toward the end of the 20th century.
Large economies such as those of the United States, Japan, and Great Britain continued to float their currencies, as did Switzerland and Canada—both relatively small economies that have preferred to retain some influence over domestic monetary conditions. Hong Kong made the opposite choice. Although it was a British colony at the time and later a part of China, it chose to fix its exchange rate to the U.S. dollar. The method it revived was a 19th-century system known as a currency board. In such a case there is no central bank and the exchange rate is fixed. Local banks increase the number of Hong Kong dollars only when they receive additional U.S. dollars, and they reduce the stock of Hong Kong dollars when U.S. dollar holdings decline. Hong Kong’s experience with its currency board encouraged a few, mainly small countries to follow its lead. Some stepped even further away from autonomous policy by adopting the U.S. dollar as their domestic currency. The most notable change of this general type was the decision by most of the continental European countries to surrender their local currencies in exchange for a new common currency, the euro.