Futures contracts all stipulate the quality of varieties. However, there are still many gaps between the quality of goods and this standard. Therefore, the exchange stipulates that if the quality is better than the standard variety, the price per ton is higher than the standard variety.

For example, when the contract price of sugar 090 1 today is 3,200 yuan per ton, the warehouse receipt of sugar in this warehouse is higher than the contract price of futures 180 yuan, that is, the warehouse receipt of sugar in this warehouse is 3,200+180 = 3,380 yuan per ton.