The explanation of constant position is a kind of position set up in ancient times to adjust rice price. When Emperor Gaozu proclaimed the Emperor, Geng Shouchang first advocated the construction, which was named after the rice price was balanced by high price when the grain was cheap and by low price when the grain was expensive. History of Food in Hanshu: "When an old farmer named Cheng Geng Shou Chang was able to use kindness as a commercial means, he was lucky ... so he ordered all border counties to build positions, increase their crops when the grain was cheap, benefit farmers, and reduce their crops when the grain was expensive, which was called' regular liquidation'. The people will do it. " Reference "General Examination of Changping Yicang Rent Tax". The explanation of word decomposition is often long and unchanging: constant. Constant (also called "constant"). Constant term permanence. Resident all year round. Resident. Always ready. From time to time, more than once: often. Regular customers. Often. Often. Ordinary: common sense. Stand. Routine. Naturally. Ordinary people. Normal. Not normal. Last name. In futures trading, after buying or selling a futures contract, the customer sells or repurchases a futures contract before the delivery date to settle the transaction amount. The difference after liquidation is surplus or loss.