The futures main contract is the continuous price of the main contract, that is to say, the main contract is the mechanical connection of all the main contracts to form a continuous contract, and the daily trading volume and positions are the largest, which will form a relatively continuous K-line chart. The main futures company is also the main company contract. The main contract is the connection of the main contracts in different periods, and the index is formed by weighting all contracts according to the volume. Obviously, there is a gap in the main contract because of the month change, and the index is the weight of all contracts, so there will be excellent continuity.

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