In the foreign exchange market and international finance, a world currency, supranational currency, or Global currency is a currency that is transacted internationally, with no set borders.
While there is officially no such thing as a world/Global currency, the U.S. dollar still is the closest thing to being just that. It may no longer be as important as during the Bretton Woods system, when most currencies were pegged against the dollar, but to this day the U.S. dollar remains the world’s de facto reserve currency.
To this day the U.S. dollar,an almost Global Currency, backed by the largest economy in the world, is widely considered a safe haven, a reliable store of value, by people and governments in regions suffering from political or fiscal instability. According to estimates Federal Reserve Board economist Ruth Judson, nearly 60 percent of all U.S. dollar billsare held overseas, up from around 20 percent in 1990