There is a spread in foreign exchange transactions, which is affected by the relationship between supply and demand in the foreign exchange market. There is also the influence of the national currency. In direct quotation, if the local currency appreciates, the foreign exchange will fall. On the contrary, the local currency depreciates and foreign exchange rises. In addition, people's psychological expectations affect the supply and demand of foreign exchange, and the inflation rate of various countries also determines the level of foreign exchange transactions, so there is a price difference in foreign exchange transactions.

The bank's bid price refers to the quotation for the bank to buy the benchmark currency. Bank selling price refers to the quotation that the bank sells the benchmark currency. The difference between the bid price and the bid price represents the bank's return on taking risks. The bid-ask spread of frequently traded euro, yen, pound and Swiss franc is relatively small, while the bid-ask spread of lightly traded currencies is relatively large. Accounting courses can be studied in www.gaodun.com.