From his 1999 Nobel Prize lecture, Robert Mundell explains the circumstances that led to the demise of Bretton-Woods and the Great Inflation of the 1970s:
The adoption of my policy mix [by JFK after 1962] helped the United States to achieve rapid growth with stability. It was not intended to and could not solve the basic problem of the international monetary system, which stemmed from the undervaluation of gold. Nevertheless the problem of the U.S. balance- of- payments was intricately tied up with the problem of the system. With very little excess gold coming into the stocks of central banks from the private market, and the US dollar the only alternative component of reserves, the U.S. deficit was the principal means by which the rest of the world was supplied with additional reserves. If the United States failed to correct its balance of payments deficit, it would no longer be able to maintain gold convertibility; on the other hand, if it corrected its deficit, the rest of the world would run short of reserves and bring on slower growth or, worse, deflation. The last scenario hinted at a repetition of the problem of the interwar period.
Two basic solutions were consistent with preserving the system. One solution was to raise the price of gold. The founding fathers of the IMF had put a provision in the IMF Articles of Agreement for dealing with a gold scarcity or surplus: a change in the par values of all currencies, which would have changed the price of gold in terms of all currencies and left exchange rates unchanged. In the 1968 election campaign, candidate Richard M. Nixon chose Arthur Burns as his emissary on a secret mission to sound out European opinion on an increase in the price of gold. It turned out to be favorable and Burns recommended prompt action immediately after the election. Nothing, however, came of it.
The other option was to create a substitute for gold. This course was in fact adopted. In the late summer of 1967, international agreement was reached on an amendment to the IMF articles to allow the creation of Special Drawing Rights (SDRs), gold-guaranteed bookkeeping reserves made available through the IMF, with a unit value equal to one gold dollar, or 1/35 of an ounce. Somewhat less than SDR 10 billion were allocated to member countries in 1970, 1971 and 1972, but they proved to be inadequate—too little and too late--to meet the main problems of the system.
On August 15, 1971, confronted by requests for conversion of dollars into gold by the United Kingdom and other countries, President Nixon took the dollar off gold, closing the "gold window" at which dollars were exchanged for gold with foreign central banks. The other countries now took their currencies off the dollar and a period of floating began.
But floating made the embryonic plans just forming for European monetary integration more difficult, and in December 1971, at a meeting at the Smithsonian Institution in Washington, D. C., finance ministers agreed on a restoration of the fixed exchange rate system without gold convertibility. A few exchange rates were changed and the official dollar price of gold was raised but the act was almost purely nominal since the United States was no longer committed to buying or selling gold.
The world thus moved onto a pure dollar standard, in which the major countries fixed their currencies to the dollar without a reciprocal obligation with respect to gold convertibility on the part of the United States. But U.S. monetary policy was too expansionary in the following years and, after another ineffective devaluation of the dollar, the system was allowed to break up into generalized floating in the spring of 1973. Thus ended the dollar standard….
With the breakdown of the system, money supplies became more elastic, accommodating not only inflationary wage developments but also the monopolistic pricing of internationally traded commodities. Each time the price of oil was raised in the 1970's, the Eurodollar market expanded to finance the deficits of oil-importing countries; from deposits of $223 billion 1971 they would explode to $2,351 billion in 1982(International Monetary Fund, IMF International Statistic Yearbook, 1988 p. 68).
Inflation in the United States had now become a major problem. It had taken twenty years, from 1952 to 1971, for U.S. wholesale prices to rise by less than 30 percent. But after 1971, it took only eleven years for U.S. prices to rise by 157 percent! This mainly peacetime inflation was greater than the war-related inflations from World War II (108 percent over 1939-48), World War I (121 percent over 1913-1920), the Civil War (118 percent over 1861-1864) or the War of 1812 (44 percent over 1811-1814). The greatest inflation in U.S. history since the War of Independence took place after the United States left gold in the decade after 1971.