This is a bet on the stock index. You are bearish on the CSI 300. If it really falls, you will earn a little 300 yuan; if it goes up, you will lose a little 300 yuan. Look at the Shanghai and Shenzhen 300. If it goes up, it will earn a little from 300 yuan, and if it goes down, it will lose a little from 300 yuan. Like the last trading day, it rose by 8.67 points. After reading it, you will earn 300 * 8.67 = 260 1 yuan, and short it will lose 260 1 yuan.