In short, one is about stock trading. A short position means that you think the stock is going to fall, so you sell all or most of your shares. At this time, the stock did not fall as you expected, but rose. If you didn't sell it, then the stock you once held will go up, but now that you have sold it, have you lost money? Second, you do stock index futures, and you buy the short side, which means that you expect to fall, but the stock index goes up, and you also lose. Short selling now refers to speculation.

In the A-share market, short selling by investors generally refers to short selling, that is, investors think that the stock will fall in the future, borrow a certain proportion of securities from securities companies through margin financing and securities lending accounts, and then sell them, repay the securities at maturity and pay certain interest.

This is mainly because brokers have proprietary trading, and they will hold stocks themselves. If these stocks are the subject of margin financing and securities lending, brokers can sell them if they are willing to lend them. However, short selling is based on the decline of stock price to make money, while investors lend shares from brokers and then fall, so brokers lose money, while investors lose money, that is to say, short selling is actually the decline of gambling stock price between customers and brokers, which reduces customers' income and increases brokers' income, regardless of ups and downs.