Foreign trade is an integral factor in the world economy, as economies all over the countries depend upon each other's foreign reserves. Foreign trade emerged in the world when the countries started having transactions and these developed into Foreign trade and then evolved Foreign Exchange.
Foreign trade emerged in the world when the countries started having transactions and these developed into Forex trade and then evolved Foreign Exchange. Usually there is no clear market structure in all forex trades and in some forex trade transactions there are no cross border regulations involved. Now different treaties are traded in single place, thanks to the Over the Counter trade, in this system all types of contracts are traded in a single window, with a small percentage of money going to the trader as commission.
Thus this explains the character of forex market, where there are no fixed rates involved and the rates of the contracts depend upon the bank or market maker. In practical conditions the rates are very close and fluctuate only in small margins as there is the activities of dealers who are watching close the activities of the market. London plays a dominant part in the foreign exchange market and that is why a call on prices and rates of contracts are done here. The role of central market clearing mechanism was tried by the joint venture of a California based firm and Reuters but they failed to do this because of various reasons.
The other trading centers such as New York, Tokyo and other countries are also important trading centers of Foreign Exchange. Banks through the world participate in foreign trade as it gives them huge revenue. The currency trading process in the foreign trade is a continuous process, when the Asian trading ends the European trading begins, when this ends the session of northern America starts.