Holding a short spot can be understood as that you will sell a certain amount of goods to customers at an agreed price in the form of contract orders at some time in the future, so you begin to face the risk of rising commodity prices during the contract period. In this case, if you buy the same amount of goods in the futures market to lock in the risk, if the price really rises sharply at maturity, then the loss caused by selling the spot at a low price will be made up by earning more profits in the futures market, which is the general principle of hedging.