In fact, the trading principle of futures is the same as spot trading, except that futures can be pre-sold after paying a deposit. You buy in 2696 and sell in 2900. Excluding the handling fee, you must make a profit. Being a futures agent is equivalent to being a middleman. You can sell the goods first or advance them. Those who sell goods now must purchase them in the future. Similarly, advanced goods will eventually be sold, and income will be earned by buying one and selling another to earn the difference.