the law of demand
相互需求法则 law of reciprocal demand
引伸需求法则 Derived demand laws
弹性需求法则 law of elasticity of demand
边际效用与需求法则 Marginal utility and demand principle
反需求弹性法则 the inverse elasticity rule
需求的定义与需求法则。
Demand: Its Definition and Its law.
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