Margin: In the futures market, both buyers and sellers have to pay a basic margin, which is usually to estimate the price risk of the day to cope with market price fluctuations. At the end of each trading day, the investor's account will be adjusted according to the value of each contract, or called market value. If the basic deposit is lower than the prescribed level after the market valuation, that is, lower than the maintenance deposit, the investor must immediately deposit additional funds so that the amount in the account can be restored to the original basic deposit level.