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Commodity futures spot is flat. Why can the spot of stock index futures be odd?
The trading volume of commodity futures is announced bilaterally.

The trading volume of stock index futures is only announced unilaterally. Therefore, there will be odd numbers in stock index futures and even numbers in commodity futures.

For example: buy one hand and sell the other, and two people make a deal; Commodity futures will announce that the current number of lots is: 2 lots; Stock index futures spot: 1 lot.