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Why is there a difference between the bid price and the bid price data in the futures market table?
For example, the current selling price of copper is 56830, and the buying price is 56820.

The declared selling price will definitely be higher than the declared buying price, otherwise who is willing to sell without making money? or vice versa, Dallas to the auditorium

Moreover, since the lowest fluctuating price of copper is 10 yuan/ton, the selling price minus the buying price must be an integer multiple of 10.

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