Short position exchange: the original short position buys and closes the position, and the new long position sells and opens the position, and the position remains unchanged. ?

Multi-payment: the original bulls sell and close positions, and the new bulls buy and open positions, and the positions remain unchanged.

Extended data:

Futures and spot are completely different. Spot is actually a tradable commodity. Futures are mainly not commodities, but standardized tradable contracts with certain mass products such as cotton, soybeans and oil and financial assets such as stocks and bonds as the targets. Therefore, the subject matter can be commodities (such as gold, crude oil and agricultural products) or financial instruments.