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构建面板门槛模型实证检验了湖南省环境规制对污染企业数量影响效应。研究发现:第一,环境规制对污染企业数量的影响存在单一门槛效应,且门槛值(人均GDP)为11 014元。第二,高门槛区间有长沙、株洲、湘潭、岳阳、益阳、衡阳、郴州、常德、娄底、张家界等地区,低门槛区间有怀化、邵阳以及永州地区。第三,环境规制与污染企业数量的相关关系并非线性,而是呈现出“U”型关系。
Building panel threshold model empirical test of the impact of environmental regulation on the number of polluting enterprises in Hunan Province. The findings are as follows: First, there is a single threshold effect of environmental regulation on the number of polluting enterprises, and the threshold (per capita GDP) is 11 014 yuan. Second, there are high threshold areas such as Changsha, Zhuzhou, Xiangtan, Yueyang, Yiyang, Hengyang, Chenzhou, Changde, Loudi and Zhangjiajie. Huaihua, Shaoyang and Yongzhou are the low threshold areas. Thirdly, the correlation between environmental regulation and the number of polluting enterprises is not linear but shows a “U” -type relationship.