In fact, the settlement and sale of foreign exchange is only the conversion between RMB and foreign currency. Because the price difference between RMB and foreign currency is very large, if the exchange rate changes slightly, it is impossible to obtain income.
Foreign exchange transactions are actually the exchange of one foreign currency into another, and each foreign currency is relatively independent, and the exchange rate changes between foreign currencies are very different, so there is no price difference factor. If you do it properly, you can arbitrage and earn some difference.