Regarding foreign exchange, why is the buying price of US dollars 650.5 1 and the selling price 658.39? The difference between them is so great that the difference between the two figures in the past is only decimal places. This price difference is the bank's handling fee, also known as the bid-ask price difference.

For example, if you have $ 100 in your hand and change it into RMB at the bank, you can change it into RMB 650 yuan. But if you want to exchange RMB for 100 USD, you need to pay RMB 655. The bank earns the price difference in the middle.