经济学中有个概念叫“边际效应”，是指消费者在逐次增加1个单位消费品的时候，带来的单位效用是逐渐递减的。
There is a concept to cry in economics "limit effect", be when showing consumer increases an unit consumable in successive, brought unit effectiveness decreases successively gradually.
经济学中有个概念叫“边际效应”，是指消费者在逐次增加1个单位消费品的时候，带来的单位效用是逐渐递减的。
There is a concept to cry in economics "limit effect", be when showing consumer increases an unit consumable in successive, brought unit effectiveness decreases successively gradually.
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