1) Because futures are forward contracts, positions are generally not more than half a year. Even if there are so-called brokerage institutions, it is difficult for brokerage institutions to grasp the short-term (half a year) trend because domestic commodity futures have no pricing power, so they all look at the international market.

2) When farmers must control a certain proportion of chips. Take stocks as an example, the total number of stocks is limited, so it can be controlled. But futures are contracts, and positions are uncontrollable. In other words, the proportion of chips needed for breeding is uncontrollable. If you can't control the chip, you can't control the market.

Sugar and rebar are relatively independent markets with little international influence, but it is not clear whether there are crops.