The buying and selling price is an obstacle. Buy one and sell one refers to the highest price willing to go long and the lowest price willing to short. There is a corresponding buy-one amount and sell-one amount.

The latest intraday price is the current transaction price. In an active contract, the price difference between buying one and selling one is only a minimum fluctuating price. The transaction price is generally expressed as the price of buying one or selling one.

If the transaction price is always displayed as the price of buy one, it means that the seller is taking the initiative to eat the bill, which shows that the purchase amount of buy one is declining. Or conversely, in the short-term operation from Dallas to the auditorium, we can feel the trend of the main funds by watching the changes in the handicap, so as to judge the position of entry and exit.

In an inactive contract, we can see that there is a big difference between buying one and selling one, and the latest price may be between buying one and selling one.