Therefore, if the selling order of 15500 is placed before the payment of 1550 1, then the transaction will be made at the price of 15500; If the buy order of 1550 1 precedes the sell order of 15500, the transaction will be made at the price of 1550 1.

If the buying and selling prices are linked at the same time (the minimum time interval recorded by the computer, such as 0. 1 second), then the transaction is made at the price closest to the previous transaction price, here is 15500.