Changing hands in an empty position refers to a trader who originally held an empty order, wants to close the empty order, and then takes the initiative to buy and close the position at the current price. At this time, the sales orders they matched were all short warehouse receipts. Because the position has not changed during the whole trading process, the short position is only transferred from one trader to another, so it is called "short position changing hands".

Short closing refers to buying and closing futures contracts that were originally short-sold. Short position refers to the increase of positions, but the added value of positions is less than the current quantity, which belongs to active selling; Long position closing refers to reducing positions, but the value-added of positions is less than the current quantity, which belongs to active selling; Short position means that the position is reduced, but the value-added of the position is less than the current quantity, which belongs to active buying.

Short selling refers to investors selling a certain number of futures contracts. Investors can choose to close their positions in advance before the contract expires; If you hold the contract until the last trading day, you must settle the futures trading through cash delivery.