Can national environmental protection supervision and control have a lasting impact on corporate production efficiency? - an empirical study based on the multi-phase difference-in-difference model.

National environmental protection supervision and control has become essential means to regulate the environmental behavior of enterprises. Furthermore, the optimization, promotion, and sustainability of relevant policies are key topics of inquiry. Taking the implementation of national environmental protection supervision policies as the time series, this paper studies the impact of national environmental protection supervision and control on corporate production efficiency.