一、环境污染的外部不经济性环境污染的社会成本来自各经济主体使用环境资源时产生的外部不经济性,因此研究环境污染的社会成本必须分析和理解外部经济理论。认识外部经济理论的前提是分析各种外部影响。所谓外部影响是指某些经济主体或个人对另一些经济主体或个人的不通过市场交易的附带影响。这些影响有的能增进相关经济主体 I. The External Economic Impacts of Environmental Pollution The social costs of environmental pollution come from the external diseconomies of various economic agents when using environmental resources. Therefore, it is necessary to analyze and understand the external economic theory in order to study the social costs of environmental pollution. The premise of understanding external economic theory is to analyze various external influences. The so-called external influence refers to the incidental influence of certain economic entities or individuals on the non-market transactions of other economic entities or individuals. Some of these effects can enhance the relevant economic subjects