Futures, also known as "futures contracts", are uniformly formulated by the futures exchange, with standard terms, allowing listing and trading. Every futures contract will have standardized terms, which specify in detail the variety, quantity and quality of the corresponding assets, the expiration time of the contract and so on. The only thing that is not stipulated is the price, which is determined by investors who participate in futures trading in the market. However, the futures contract stipulates the minimum change price, and investors must quote an integer multiple of this price every time. In addition, the trading of futures contracts also adopts the margin system. Investors only need to pay a certain percentage of the contract value of the deposit, they can be small and broad. Investors can buy contracts at low prices, wait until the contract price rises, and then resell them for profit; You can also sell the contract at a high price and buy it back at a low price.