According to the information provided by Legal Express, it is generally not illegal to help people buy things to earn the difference, but if they buy goods that need to obtain a business license, it may constitute an illegal business operation crime.

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.