Futures contracts have an expiration date, after which physical delivery is required. Ordinary investors earn the difference and will not make physical delivery, so there is such an operation as moving empty positions.
For example, if investors short the gold futures contract of 65438+February, if they continue to short, they will continue to hold empty orders, close the empty orders of the current month before the delivery date of 65438+February, and open long-term empty orders, such as those of 65438+ 10 or February.