Marginal benefit is a concept in economics, which can be roughly understood as: in order to maximize profits, economic entities in a market expand production many times, and there will be a difference between the benefits generated by each investment and the benefits generated by the last investment, which is called marginal benefit. The basic concept of western economics, Baidu, is that there is no substantial connection between diminishing marginal benefits and the rise and fall of futures commodities, but an analogy. Just as the price of cotton is based on the spot price of 28 thousand, the fund has the best promotion effect in the price range of 28 thousand-29 thousand. More funds may be needed after 30 thousand, and it will be more difficult to compete over 32 thousand, even repeatedly.

Commodities have no marginal benefit to enterprise production, that is, the value of products produced by this ton of cotton and the next ton of cotton has not decreased.