The externality theory is one of the most important theories in contemporary economics, particularly in the new institutional economics.

外部性理论是现代经济学，特别是新制度经济学的重要理论之一。

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Then introduces the relevant theories of Regulation Economics and New Institutional Economics that used in this paper.

然后介绍了分析所运用的规制经济学和新制度经济学的相关理论。

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The paper finally makes a comparative study on the theories of new comparative economics, new institutional economics, and public choice.

最后，本文对新比较经济学与新制度经济学及公共选择理论进行了比较研究。

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