The Interbank market serves most of the commercial turnovers and the vast amounts that are involved in speculative trading. This market deals with large banks that trade in billions of dollars every day. Some of the trading activity can be done for corporate customers but the treasury rooms of these banks can also participate in large volume and amounts in trading. The bank dealers will, of course, profit well from these activities as well.
The Central Banks
Sometimes, however, the central bank may not be able to achieve their primary objectives. Sometimes, no matter what they do or maybe they acted too late, the inflation soars and the currencies get too weak. When this happens, it will be the other participants within the Forex trading that will help out.
Commercial Companies and Retail Brokers
Banks do no usually get involved in foreign exchange trading for retail customers; neither do they have the necessary resources or the inclination to support any retail clients. The retail brokers on the Forex act similarly to the stock and mutual funds brokers and usually provide a service oriented approach to their physical and virtual clients online.