Value preservation is definitely to prevent corn from falling in price, so short.
When shorting, futures go up, you lose money in futures and make money in spot, so you keep your value, and you don't lose money or make money.
When the commodity falls, you make money in the future and lose money in the spot, so you still keep the value and you don't lose money.
Therefore, to make money by speculating in futures, we should dig up the spot by ourselves, or operate the spot trading by ourselves according to the guiding role of futures market prices on the spot market prices.
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