For example:
An investor holds a stock index futures contract 10 on the last trading day, and the settlement price on the last trading day is 1500 points. On that day, the investor bought 8 long positions in the contract at the transaction price of 1505, and sold 5 positions at the transaction price of 15 10. The settlement price of the day is 15 15, so the profit and loss of the day is calculated as follows:
Profit and loss of the day = (1510-1505) × 5+(151505) × 3+(1505)
If the contract multiplier of the contract is 300 yuan/point, the investor's profit and loss on that day is 205 points ×300 yuan/point =6 1500 yuan.
On the one hand: total profit and loss = closing price-opening price. Whether you make a profit or lose depends on whether you buy at a high price or sell at a low price. If you open a position and buy, the closing price is higher than the opening price, which is profit; If you open a position and sell it, and the closing price is higher than the opening price, it is a loss. On the contrary, if you buy when you open a position, the closing price is lower than the opening price, you lose money; if you sell when you open a position, the closing price is lower than the opening price, you make a profit. On the other hand: total profit and loss = market value profit and loss+position profit and loss. Whether it is profit or loss depends on whether the total profit or loss is positive or negative.