1, different varieties, different quantities of target commodities represented by each lot, such as 200 tons of thermal coal and 60 tons of coking coal;

2. Different kinds of goods have different prices. At present, there are about 500 thermal coal, 7800 coking coal and coke 1 000.

3. Different varieties have different price fluctuations, different risks, and different requirements for margin and handling fees. Naturally, the final result will also affect the price.