In order to cover the main domestic commodity varieties and overcome the shortage of domestic listed futures varieties, the China Commodity Composite Index of the monitoring center adopts the mode of futures plus spot to select commodity varieties. According to the importance of commodities in the domestic economy, 2 1 futures varieties and 9 spot varieties are selected to enter the index. The base period is July 2008 1, and the base point is set to 100. From then on, July 1 is the weight adjustment day every year. Futures varieties choose the closing price of the main contract, and spot varieties choose the domestic representative spot market price. The index is calculated according to the average consumption and corresponding price of each commodity in the first three years. The index is updated once a day.
China Commodity Composite Index of Monitoring Center consists of four sub-indices: energy and chemical products, metal products, agricultural and livestock products and agricultural products (00006 1, Guba). Energy chemical products include PTA, PVC, LLDPE, natural rubber, fuel oil, gasoline, diesel oil, thermal coal and coking coal. Metal products include copper, aluminum, lead, zinc, nickel, tin, steel, gold and silver. Agricultural and livestock products include corn, soybean, wheat, soybean oil, rapeseed oil, palm oil, soybean meal, rice, sugar, cotton, pork and beef 12; Agricultural products include 10 commodities other than pork and beef in agricultural and livestock products. The composite index includes all the above 30 commodities. The calculation base period, base point and calculation method of classification index and comprehensive index are the same.