Are smart cities green? The role of environmental and digital policies for Eco-innovation in China
研究中国2006-2018年数据，发现严格环境政策与数字政策（如人工智能、物联网）共同实施时，城市绿色专利产出增加，对发展中国家可持续转型有启示。
In this paper, we employ negative binomial and quasi-natural experimental methods (i.e., Difference-in-Differences and Propensity Score Matching), whereby we examine the joint impact of environmental and digital policies (for designing smart cities) upon the generation of eco-innovations in China. Using longitudinal data for the period 2006–2018, we examine the changes in green patents granted: (i) due to the implementation of various levels of stringency of environmental policies across all cities; and (ii) after the introduction of smart city policies in 2012 in China. The prior literature stresses the importance of environmental policies, yet less attention has been paid to digital policies required to drive eco-innovation and their spatial dimension in the context of a developing economy. Our results show that, when digital policies (artificial intelligence and internet of things) are implemented in cities that have adopted strict environmental policies, the production of green patents increases. We contribute to debates in the literature of policy mix for sustainability transitions in the context of a developing economy by illustrating the importance of both types of policy for eco-innovation, as they correct two market failures and, more importantly, address the systemic coordination problems that occur during the production of green patents.