after the opening of stock index futures, the short-selling market should be understood from its connotation, and it should also include constantly shorting the stock market, forcing bulls to "buy at the bottom" halfway up the mountain. However, because they can't stand the process of continuous decline, they continue to cut meat, and even when the market is completely bearish, they will quickly do more and don't give short positions a chance to make up; Short futures index, and then bargain-hunting the secondary market, so constantly reciprocating up and down to "force the air" and earn multiple benefits.