环境权益交易对企业绿色创新的影响研究——基于二氧化硫排污交易政策视角

Impact of Environmental Rights Trading on Green Innovation of Enterprises:From the Perspective of Sulfur Dioxide Emission Trading Policy

以二氧化硫排污交易政策试点作为准自然实验,结合1998—2021年中国工业企业数据,研究发现该政策能够推动企业进行绿色创新,一系列稳健性检验后该结论仍然成立。同时也发现,该政策推动绿色创新的核心机制是促进不同类型企业之间的专利分工。值得注意的是,该机制对清洁型企业的促进作用大于混合型企业,并且还进一步促使清洁型企业向混合型企业转让和许可绿色专利。这种促进专利分工的机制可以产生知识溢出效应,从而有效推动企业绿色创新。研究结果表明,环境权益交易市场可以通过促进专利分工,激励企业进行绿色创新。

In this paper, the pilot trading policy of sulfur dioxide emission is applied as a quasi-natural experiment of the environmental rights trading market, combined with the data of China's industrial enterprises from 1998 to 2021.The results show that sulfur dioxide emission trading policy can promote enterprises' green innovation, and the conclusion is still valid after a series of robust tests and endogeneity treatments.The core mechanism of the policy to encourage green innovation is to promote the patent division among different types of enterprises, which has a more significant promoting effect on clean enterprises than hybrid enterprises and further induces the transfer and licensing of green patents from clean enterprises to hybrid enterprises.Additionally, knowledge spillover is an important basis for the effective play of this mechanism.This study shows that the environmental rights trading market can stimulate enterprises' green innovation by promoting patent division.