城市环境立法能够提升企业出口国内附加值率吗?——基于双重差分模型（DID）的实证研究
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张兵兵, 胡榴榴
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Can urban environmental legislation improve the enterprises export domestic value added ratio? Empirical research based on difference-in-differences (DID) model
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ZHANG Bingbing, HU Liuliu
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表8 城市环境立法影响企业出口DVAR的传导机制检验（I）
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Tab. 8 Examination of the transmission mechanism of urban environmental legislation affecting enterprise DVAR (I)
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| （1） | （2） | （3） | （4） | （5） | （6） | （7） | | dvar | dvar | dvar | markup | markup | dvar | dvar | | post×treat | -0.0059***
(-2.85) | | | 0.0318***
(3.80) | | -0.0062***
(-3.02) | | | post×treat×clean | | -0.0017
(-0.73) | | | | | | | post×treat×poll | | | -0.0083***
(-2.91) | | 0.0504***
(3.87) | | -0.0088***
(-3.10) | | markup | | | | | | 0.0103***
(6.07) | 0.0103***
(6.07) | | _cons | 0.9795***
(16.89) | 0.9754***
(16.85) | 0.9746***
(16.86) | 2.2680***
(22.55) | 2.2944***
(23.07) | 0.9561***
(16.44) | 0.9509***
(16.39) | | Control | YES | YES | YES | YES | YES | YES | YES | | ai | YES | YES | YES | YES | YES | YES | YES | | at | YES | YES | YES | YES | YES | YES | YES | | aj | YES | YES | YES | YES | YES | YES | YES | | ap | YES | YES | YES | YES | YES | YES | YES | | N | 181923 | 181923 | 181923 | 181923 | 181923 | 181923 | 181923 | | adj. R2 | 0.089 | 0.089 | 0.089 | 0.063 | 0.063 | 0.092 | 0.092 |
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