Mark-to-market settlement every day, settlement price-purchase price =50* 10=500 on the first day of settlement. After settlement, the profit is credited to the account and the loss is deducted from the account. The settlement on the second day is the settlement price on the second day-the settlement price on the first day, the selling price on the third day-the settlement price on the second day.

Futures is a daily settlement system, in which the profits of the day are transferred to the account and the losses are withdrawn from the account.