The relationship between the whole and the part is similar to the relationship between the market and individual stocks, but the difference is that agricultural products, non-ferrous metals, black series and so on often come and go. Take today as an example, agricultural products go up, black products go down, and colored industrial products go down slightly. Therefore, the upper and lower shadow lines of the Wenhua Commodity Index are long, and the yinxian entity is small, and the whole is empty.