If you want to close your position quickly, use the selling price; If you want to close your position quickly, use the buying price. If you close your position, it's the same. Basically, the selling price will be higher than the latest price, and the buying price will be lower than the latest price. If you want a better starting point, don't press the price of your opponent, but when the opportunity comes, you may not be able to clinch a deal. For example, if you make a multi-Shanghai copper 1 107 contract, your order is to buy an open position of 69500. At this time, the selling price jumps to 69500, and you have a deal. Of course, the system matches the transaction according to the order time. If many people place more orders at this price before you, it is possible that your order will not be closed for a long time, or it has jumped to 695 10 to reach your price.