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一、引言外部性是指一个行为主体的经济活动对另一个行为主体所产生的“非市场性”的附带影响。按照兰德尔的定义:外部性是用来表示当一个行动的某些效益或成本不在决策
I. INTRODUCTION Externality refers to the incidental effect of the economic activity of one actor on the “non-marketization” produced by another actor. According to Randall’s definition: Externality is used to mean that when some benefit or cost of an action is not in the decision