Selling positions is an act in futures trading.

Selling a futures contract that is about to expire and buying an unexpired futures contract is the act of dumping a position.

For example, today is July 3 1, and now you have a futures contract that expires in August 1, so you sell all the futures contracts that expire in August 1 and buy futures contracts that expire in September 1.

B

There are upside-down and knocking behaviors in stock trading.

Yes, it is the act of reselling a stock between the main players to suppress or raise the stock price.

For example, Zhang San has an account, and Li Si also has an account. Zhang San and Li Si have the opposite behavior of buying and selling a stock back and forth. If it is sold lower and lower, it is to suppress the stock price, and vice versa.

Counterknock is the behavior that the main force resells a stock on its own, thus suppressing or raising the stock price.

For example, Zhang San has two accounts, and his behavior of buying and selling one of his own stocks back and forth with these two accounts is knocking. If it is sold lower and lower, it is to suppress the stock price, and vice versa.

Contrast and knocking at the door are the behaviors of large households, and retail investors do not have this ability.