Note: Short selling means that if you predict that the stock index will drop to 1500 at 2000, then you will sell the stock index futures contract of 1500 at 2000. If it is 500 yuan, according to the regulations, you only need to pay 10% of the delivery funds, plus 8% of the deposit (minimum); Then the delivery fee you actually have to pay is 500 cents *500 cents/yuan *10% = 25,000 yuan; The deposit is 500 points *500 points/yuan * 8% of the total amount = 20,000 yuan; If the contract expires and the score is 1500 as you wish, then you can get 500 points *500 points/yuan = 250,000 yuan, which means that you earned 250,000 yuan with 2.5 yuan's investment, with a yield of 900%; In the same way, if the point rises to 2500 instead, you will lose 250 thousand.
This is roughly explained by the market index, and stocks are the same principle; Of course, there are more specific problems in operation. For example, as the market changes, brokers will continue to pay deposits. If you delay paying the deposit, you will face the result of forced liquidation at any time, and so on.