【圖集】超可愛的神奇寶貝萬聖節南瓜燈~
Marginal utility - Wikipedia, the free encyclopedia這個手藝真的太巧了啦~>////In economics, the marginal utility of a good or service is the gain from an increase or loss from a decrease in the consumption of that good or service. Economists sometimes speak of a law of diminishing marginal utility, meaning that the first unit of co...
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