The foreign exchange, or forex, market is relatively young, having begun in the early 1970s after the United States dropped the gold standard and national currencies started to fluctuate widely. For about 30 years prior to that, most nations had agreed to keep their currency values stable in relation to the U.S. dollar, making a forex market unnecessary. With that no longer the case, banks quickly realized that a profit could be made in "buying" currency when it was devalued and "selling" it after it strengthened, just like any other commodity.