什么是吉芬商品?能否举例?如何形象地解释什么是边际效用?怎么就能从边际效用的递减规律就决定需求定理了? 知乎 Template




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tomski什么是吉芬商品?能否举例?如何形象地解释什么是边际效用?怎么就能从边际效用的递减规律就决定需求定理了? 知乎 coloring