Foreign exchange quotation, that is, the foreign exchange quotation of designated foreign exchange banks, is the buying and selling price between various foreign currencies and RMB set by banks (referring to the same foreign exchange quotation of the head office, branches and head offices) according to the middle price of RMB market and the middle price of international foreign exchange market published by the People's Bank of China. This foreign exchange quotation changes in real time, even on the same day.