What is the difference between the premium of stock index futures and the premium of commodity futures?

There are two concepts of upward discount.

1, delivery premium, because the commodity futures delivery exchange will specify the delivery grade of commodities, so when the commodities with lower (higher) grades are delivered, a certain premium (premium) will be paid, but because the stock index futures are delivered in cash, there is no delivery premium.

Generally speaking, when the futures price is higher than the spot price, the futures premium is the spot premium, and vice versa. This premium stock index futures is no different from commodity futures.

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