CRB index is a commodity index, which reflects the international commodity futures price according to the prices of several basic economically sensitive commodities in the world market. The 19 futures contracts covered by CRB index and their proportions are as follows:

Agricultural products: soybean 6% wheat 1% corn 6% cotton 5% sugar 5% frozen concentrated orange juice 1% cocoa 5% coffee 5% live cattle 6% lean pig 1%.

Energy: crude oil 23%, heating oil 5%, gasoline 5%, natural gas 6%.

Metal: gold 6% silver 1% copper 6% aluminum 6% pink1%.