In the foreign exchange market, the spread is automatically generated, not fixed. Due to the different nature of foreign exchange dealers and the different ways of collecting commissions and handling fees, the form of fixed spreads exists.

Foreign exchange transaction is the exchange of one country's currency with another. Different from other financial markets, the foreign exchange market has no specific location and no central exchange, but transactions between banks, enterprises and individuals through electronic networks. "Foreign exchange trading" means buying one of a pair of currencies at the same time and selling the other.

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