1, in China's futures market, open position refers to the sum of positions bought (or sold) before open position, and generally refers to the sum of open contracts in the buying and selling directions, so it is generally even.

2. The continuous positions in foreign futures markets refer to the total number of open contracts accumulated by all traders at the close of the day, which is the sum of unilateral buying or selling, not the sum of both parties, so there are both odd and even positions;

3. In China's financial futures trading, the Shanghai and Shenzhen 300 index futures also use unilateral sum, so the positions are also odd and even.

Although everything else is even, the bid-ask price is a value recognized by human psychology. For example, some people think 2400 is cheap, while others think 2450 is cheap. When they declared, the same people sold at the price of 2400, and some people sold at the price of 2450, so the deal was made and the price went up.