The A-share market has not yet opened the margin trading function, so there is no margin trading. In foreign exchange, futures (including future stock index futures) and gold markets, there are different proportions of margin trading. For example, margin trading with leverage of 10 times means that if you deposit a margin of 1 10,000 yuan, you can get a transaction of10,000 yuan. If you use this 100,000 yuan to make a profit 10%, it is equivalent to your 1 10,000 yuan principal profit 100%. Similarly, if you lose 10%, then your 1 10,000 yuan principal will be gone. However, generally, when your loss is less than 10%, the brokerage firm has forced you to close your position (that is, stop loss in the stock market). But if there is a continuous limit, then you can't close your position, and you may still owe money to the broker. Margin trading exists because the fluctuation of many investment targets is quite small, and it is difficult to make a profit in trading. For example, many A-shares have doubled to several times this year, but if the US dollar has also increased several times in half a year, wouldn't the financial system around the world be in chaos? Last year's economic crisis was more the result of the spread of "virtual economy" crisis to "real economy". Margin trading is one of the chief culprits of the "virtual economy" crisis. The leverage of foreign exchange margin trading is as high as 200 times, which means that if your trading direction is wrong by 0.5%, then you have nothing. Everyone made a lot of money in the bull market, but once the bear market came, even the largest financial institutions could only close down one after another. This is also the reason why western countries have been committed to "deleveraging".