.....Are Banks. Forex markets involve trading currencies between various banks, countries, brokers and small investors. Trading between banks also known as interbank trading makes up to 50% of total forex trading that is done through out the world. Banks use this method to make more money for themselves and their shareholders. Many commercial companies like Citigroup, HSBC, Merill Lynch and others also trade in Forex. Central banks play a major role in Forex markets and control the supply and availability of money. They also control the interest rates.

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