For example, the margin is 10%, and 10000 yuan can be used to buy and sell futures contracts.

If the investor loses money, the futures company will ask the investor to add margin. If the investor fails to add the margin in time, the futures company will close the warehouse receipt with insufficient margin at an appropriate time.

However, if it is an extreme market, the price trend of futures contracts is not conducive to investors' three-time stop loss (stop loss cannot be closed, but exchanges generally arrange loss-making customers to stop loss for three times in a row), and the cumulative increase and decrease will be greater than 10%. Assuming that the cumulative fluctuation range is 15%, the investor loses 15000 yuan, minus the original margin 10000 yuan, and the investor should also pay the futures company a margin of 5000 yuan. If the investor fails to add the margin in time, the futures company has the right to recover from the investor.