There is no clear buying and selling price at present. If the margin is only calculated according to% of the market price, then the margin transaction will be conducted on the basis of% stipulated by the exchange, and there is no clear price regulation. As long as the transaction price fluctuates, the margin will fluctuate up and down. Moreover, the price of each contract will be different. At present, the general price of corn is around 2300. If you are a novice, you can invest 3000 yuan and start trading with one hand. When you are proficient, consider making a big variety. People who can do a good job in futures also need a spirit of learning and analysis, and they need to be cautious when entering this market.