Revenue = (transaction price minus opening price) times 1.5 times the number of lots. According to relevant information, revenue refers to operating income, and transaction price refers to the price agreed by the buyer and seller of goods or services. The opening price is the cost price, the number of lots is the unit of measurement of the number of stocks, and the first hand is a trading unit. Stock index futures, abbreviated as SPIF in English, are full-name stock price index futures, which can also be called stock price index futures and futures index. It refers to the standardized futures contract with the stock price index as the subject matter. Both parties agree that at a future date, they can buy and sell the underlying index according to the size of the stock price index determined in advance, and settle the difference in cash after the expiration. As a type of futures trading, stock index futures trading has basically the same characteristics and processes as ordinary commodity futures trading.