If the price gap is too big, you can directly find customer service to make up the difference, or ask for a return.

The price difference refers to the futures price difference of different grades, different delivery months, different commodities and different delivery locations.

It also refers to the price difference of the same commodity due to various conditions, such as wholesale and retail price difference, regional price difference and seasonal price difference.

The difference between buying and selling goods is the main part of some businessmen's profits.