energy storage strength enterprise ranking
Impact of government subsidies on total factor productivity of energy storage enterprises . Control variables. Drawing on related studies (Lin and Zhang, 2023; Cheng and Meng, 2023; Ren et al., 2023), the control variables are selected as follows: (1) Profitability (ROA), expressed as the net profit divided by the average total assets; (2) Cash, measured by the ratio of net cash flow to …