Why is the main plastic contract 1, May and September? Please give a more detailed answer, thank you.

Every kind of futures trading has a main contract. At present, the main plastic contract 120 1 is the delivery contract for next year 1 month. There is no reason. Generally speaking, the time from the delivery month is different, and the trading volume of this contract and the position of funds are also different. The one with the largest transaction volume becomes the assistant contract.

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