The yen is the official currency of Japan. It is the third-most traded currency in the foreign exchange market, after the United States dollar (US)andtheeuro.ItisalsowidelyusedasathirdreservecurrencyaftertheUSdollarandtheeuro.TheNewCurrencyActof1871introducedJapan′smoderncurrencysystem,withtheyendefinedasofgold,orofsilver,anddivideddecimallyinto100senor1,000rin.TheyenreplacedthepreviousTokugawacoinageaswellasthevarioushansatsupapercurrenciesissuedbyfeudalhan(fiefs).TheBankofJapanwasfoundedin1882andgivenamonopolyoncontrollingthemoneysupply.FollowingWorldWarII,theyenlostmuchofitsprewarvalue.TostabilizetheJapaneseeconomy,theexchangerateoftheyenwasfixedat¥360perUS as part of the Bretton Woods system. When that system was abandoned in 1971, the yen became undervalued and was allowed to float. The yen had appreciated to a peak of ¥271 per USin1973,thenunderwentperiodsofdepreciationandappreciationduetothe1973oilcrisis,arrivingatavalueof¥227perUS by 1980.
Since 1973, the Japanese government has maintained a policy of currency intervention, so the yen is under a "dirty float" regime. The Japanese government focused on a competitive export market, and tried to ensure a low exchange rate for the yen through a trade surplus. The Plaza Accord of 1985 temporarily changed this situation; the exchange rate fell from its average of ¥239 per dollar in 1985 to ¥128 in 1988 and led to a peak rate of ¥80 against the US$ in 1995, effectively increasing the value of Japan's GDP in dollar terms to almost that of the United States. Since that time, however, the world price of the yen has greatly decreased. The Bank of Japan maintains a policy of zero to near-zero interest rates and the Japanese government has previously had a strict anti-inflation policy.
Yen derives from the Japanese word 圓, which borrows its phonetic reading from Chinese yuan, similar to North Korean won and South Korean won.