It's very detailed. By the way, the primary price of corn is 10 ton, and the primary actual price is 22,000. If the margin 10% is 2200, the balance is 2800. When the price rises to 2480, the actual price is 24800, and you lose 2800, and your account is out of money, the futures company will even you out without adding money. The exchange will not lose money.