The Impact of Digital–Financial Dual Pilot Policy on Carbon Emission Efficiency: Evidence from Chinese Cities

Enhancing carbon emission efficiency is crucial for achieving carbon reduction and economic growth. This paper focuses on the digital–financial dual pilot policy formed by the Broadband China strategy pilot (BCP) policy and the Promoting Science and Technology to Combine with Finance pilot (TFCP) policy. Using the panel data of 284 prefecture-level cities in China from 2007 to 2022 and nighttime light data, this paper adopts the super-efficiency SBM model to calculate urban carbon emission efficiency. Based on this efficiency, this paper employs the staggered difference-in-differences model to discuss the impact of the dual pilot policy on urban carbon emission efficiency. The research results indicate that the dual pilot policy significantly improves urban carbon emission efficiency, and compared to the single pilot policy, the dual pilot policy has a greater effect on improving carbon emission efficiency. This conclusion still holds after the parallel trend test, heterogeneous treatment effects test, and other robustness tests. Mechanism analysis demonstrates that the dual pilot policy enhances urban labor, capital, and credit resource allocation efficiency and green technological innovation by generating resource allocation and collaborative innovation effects, thereby improving urban carbon emission efficiency. Further analysis reveals that implementing the TFCP policy first, followed by the BCP policy, can more effectively maximize the dual pilot policy’s positive impact on urban carbon emission efficiency. The impact of the dual pilot policy on urban carbon emission efficiency exhibits heterogeneity, depending on the resource endowment, digital infrastructure level, administrative hierarchy, economic and financial development level, and intellectual property protection intensity of cities. This paper provides valuable insights for effectively implementing the dual pilot policy and achieving a win–win outcome in carbon reduction and economic development.