The word spread comes from foreign exchange transactions. Generally, market makers use it more. The buying price is 15 and the selling price is 16. 1 in the middle is the price difference. The market maker 15 buys from A 16 sells to B, and the middle 1 is the income.
There are two kinds of domestic futures commission, one is fixed, and the other is charged according to the proportion of several ten thousandths of the transaction amount.
The cost of a futures company is generally: the handling fee charged by the exchange+investor protection fund+various miscellaneous fees and so on.