There is no standard. There is no specific standard for the loss of first-hand corn futures, because futures use margin trading rules, and the margin of each variety of futures is different, so the degree of decline and short position is different. Generally speaking, when the margin is less than 0, it means that part of the margin will be increased. If it is not added, it will be forced to close the position, and the funds for the explosion after the forced liquidation will be borne by the investors themselves. In other words, when the risk of the product is greater than 100%, it will break out. Explosion generally refers to forced liquidation. Forced liquidation is also called forced liquidation, which is also called being cut, cut and exploded.