China Securities Network News (reporter Ma Shuang) Dalian Commodity Exchange issued the "Announcement on Adjusting the Minimum Change Price of Linear Low-density Polyethylene and Polyvinyl Chloride Varieties Standard Warehouse Receipt Transactions" on October 27, 2021, saying that from November 1, 2021, the minimum change price of line-type low-density polyethylene and PVC varieties standard warehouse receipts was adjusted from 5 yuan / ton to 1 yuan / ton.