资金扶持与省份协同:环境治理政策绩效差异探析——以新能源汽车公共物品供给扶持政策为例

Financial Support and Provincial Collaboration:An Analysis of the Differences in Environmental Governance Policy Performance——Taking the Support Policy for Public Goods Supply of New Energy Vehicles as an Example

本文以新能源汽车的基础设施充电桩为例,研究政策激励、省际协同两个政策工具在公共物品供给政策实施效果上有怎样的差异。利用2017年6月到2018年12月共19个月的月度省级面板数据,通过logit模型和决策树模型的对比发现:第一,以补贴为代表的促进新能源汽车公共产品供给政策的实行可以促进空气质量的提升,其中,3400元和10000元的补贴数额是影响政策实施效果的两个关键数值。第二,在政策对象方面,针对受政策协同作用影响的省份的实施效果比针对其他省市的实施效果更明显,环境治理中的省份协同作用有待加强。本研究力图使新能源汽车公共物品供给政策的设计更为高效,同时引入决策树模型能够更好地解释变量间的因果机制,在衡量政策实施效果方面实现方法创新。

How will the two policy tools of policy incentives and inter-provincial coordination have different effects on the implementation of public goods supply policies?Using the monthly provincial panel data from June 2017 to December 2018 and comparing the logit model and the decision tree model,this research finds that the new energy vehicle public product supply policy represented by subsidies can promote the improvement of air quality.Among them,3,400 yuan and 10,000 yuan are the two key figures that affect the implementation of the policy.Moreover,in terms of policy objectives,the implementation effect of the provinces affected by policy synergy is more obvious than that of other provinces and cities.These results contribute to promoting the design of new energy vehicles public goods supply policy more efficiently.At the same time,the decision tree model can better explain the causal mechanism between variables and shed light on measuring the effect of policy implementation.