The middle price, also called the intermediate exchange rate, is the average of the buying exchange rate and the selling exchange rate. Its calculation formula is: intermediate exchange rate = (buying exchange rate+selling exchange rate) ÷ 2.

Bid price: the price quoted by a bank to buy the benchmark currency.

Selling price: the price quoted by the bank to sell the benchmark currency.

Foreign exchange quotation adopts two-way quotation, that is, the bidder simultaneously quotes the buying exchange rate and selling exchange rate of the benchmark currency.

Take A/B =1.1500/10 as an example, where A is the base currency and B is the quotation currency.

The former is the exchange rate when the offeror buys the benchmark currency A (buying a benchmark currency to pay the amount of the quoted currency B), and the latter is the exchange rate when the offeror sells the benchmark currency A (selling a benchmark currency A will charge 1. 15 10 quoted currency B), and the bid-ask difference will be regarded as the income of the offeror's intermediary.