Because speculation in grain will be attacked by the state at the first time, just as it is illegal for private people to buy in large quantities in the grain market. Last time it was reported that someone was arrested for harvesting corn. Later, the public opinion was too big and I was sentenced to probation. I don't remember. You can check it online. The state specially buys grain from participating units and deputy ministerial cadres of the Grain Bureau. What kind of capital dares to find such uncomfortable behavior?