other major currencies, were undervalued motivated the United States' actions in 1971. Following the United States' measures to devalue the dollar in the summer of 1971, the Japanese government agreed to a new, fixed exchange rate as part of the Smithsonian agreement, signed at the end of the year. This agreement set the exchange rate at ¥308 per US$. However, the new fixed rates of the Smithsonian agreement were difficult to maintain in the face of supply and demand pressures in the foreign-exchange market. In early 1973, the rates were abandoned, and the major nations of the world allowed their currencies to float. Yen adoption in Okinawa After World War II the United States-administered Okinawa issued a higher-valued currency called the B yen from 1946 to 1958, which was then replaced by the U.S. dollar at the rate of $1 = 120 B yen. Upon the reversion of Okinawa to Japan in 1972 the Japanese yen then replaced the dollar. In light of the dollar's reduction in value from ¥360 to ¥308 just before the reversion, an unannounced "currency confirmation" took place on October 9, 1971, wherein residents disclosed their dollar holdings in cash and bank accounts; dollars held that day amounting to US$60 million were entitled for conversion in 1972 at a higher rate of ¥360. Japanese government intervention in the currency market In the 1970s, Japanese government and business people were very concerned that a rise in the value of the yen would hurt export growth by making Japanese products less competitive and would damage the industrial base. The government, therefore, continued to intervene heavily in foreign-exchange marketing (buying or selling dollars), even after the 1973 decision to allow the yen to float. Despite intervention, market pressures caused the yen to continue climbing in value, peaking temporarily at an average of ¥271 per US$ in 1973, before the impact of the 1973 oil crisis was felt. The increased costs of imported oil caused the yen to depreciate to a range of ¥290 per US$ to ¥300 per US$ between 1974 and 1976. The re-emergence of trade surpluses drove the yen back up to ¥211 in 1978. This currency strengthening was again reversed by the second oil shock in 1979, with the yen dropping to ¥227 per US$ by 1980. Yen in the early 1980s During the first half of the 1980s, the yen failed to rise in value,