Let me give you an example: Now you want to sell the May sugar contract of 20 10 in the futures market, and 1 hand is 4000 yuan. If someone buys it, then the transaction is valid and you have an empty order in your hand. If no one buys it, please note-this contract does not exist!
According to the existence of the above contract, the delivery will start in May of 20 10. If the market price at this time is 4 100 yuan, then obviously, you will lose 1000 yuan, because according to the contract, you must sell it to 1 hand at a price of 4,000 yuan/ton (that is, 1 hand). On the other hand, if the market price is 3900 yuan at this time, then the buyer must be a big head, fulfill the contract, and spend more 100 yuan per ton to eat your 10 ton of sugar.
This explanation should be understandable, and I think it is detailed enough.