The selling price is the exchange rate at which the bank sells foreign currency to customers, that is, the exchange rate at which customers purchase foreign exchange from banks; The bid price is the quotation when the bank buys foreign exchange or foreign currency from customers, which is divided into spot purchase price and spot purchase price. The cash purchase price is the quotation when the bank buys cash, and the cash purchase price is the quotation when the bank buys foreign currency cash.

Cash and cash are different concepts, and they are two different forms of foreign currency deposited in banks. Paper money can be stored and taken away, but not remitted, and can only be taken out if it is converted into paper money; But remittance can be sent abroad like remittance, but paper money can't. They must be converted into cash.

As for why it is different, it is because banks will take risks in the process of foreign exchange trading, so they should control the spread to earn the cost of providing services.

The selling price of cash and cash is the same, that is, the selling price.

Middle price = (spot buying price+spot selling price) /2

The benchmark price is a middle price announced by the People's Bank of China. Other commercial banks can set their own buying and selling prices on the basis of the benchmark price and according to the floating range stipulated by the People's Bank of China.

The middle price is formed by the market, and the benchmark price is announced by the People's Bank of China.