【答案解析】The foreign exchange market is not located in any one place, but an integration of the various trading centers. It is a global single market of banker of banks, brokers, and foreign exchange dealers. The foreign exchange market has been growing at rapid pace, which reflects a general growth in the volume of cross-border trade and investment. The foreign exchange market never sleeps. There are only 3 hours out of every 24 that London, New York, and Tokyo are not all shut down. During these three hours, trading continues in a number of minor centers, particularly San Francisco and Sydney. Most transaction in the foreign exchange involved dollars. This is true even when a dealer wants to sell one nondollar currency and buy another.