The compilation of CRB index is similar to that of consumer price index. The latest CRB index includes 19 commodity futures price index!
The varieties of 19 futures contracts covered by the index are as follows:
Agricultural products: soybean (6%), wheat (1%), corn (6%), cotton (5%), sugar (5%), frozen concentrated orange juice (1%), cocoa (5%), coffee (5%) and live cattle (6.
Energy: crude oil (23%), heating oil (5%), gasoline (5%) and natural gas (5%);
Metals: gold (6%), silver (1%), copper (6%), aluminum (6%) and nickel (1%).