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
Can urban environmental legislation improve the enterprises export domestic value added ratio? Empirical research based on difference-in-differences (DID) model
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 |
| 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 |
| ZHANG Bingbing, HU Liuliu |
| 图3 平行趋势检验图 |
| Fig. 3 Parallel trend check chart |
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