Yes, too many sets of PVC futures will really put some pressure on the price increase, and it will not work if it rises too much. Locking refers to the futures contract held by the holder, and the actual cost is higher than the current market price. When the market price is lower than the actual cost of the holder, a lock-up disk will be formed. A large number of lock orders means that there are many holders of high-cost contracts in the market, who tend to sell because of losses, thus increasing the pressure of selling orders and restraining the price increase.