Through analysis and comparative study above, the author reaches three conclusions.

通过以上三章的分析和比较研究，得出三个结论。

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Method of economic analysis and comparative study are employed in the paper.

研究方法：经济分析法和实证比较法。

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Method of economic analysis and comparative study are employed in the paper.

研究方法：经济分析法和实证比较法。

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