Can Marketization Improve Sustainable Development in Northeastern China? Evidence from the Perspective of Coupling Coordination Degree Model

Table 1

Evaluating indicator system of SE and EE subsystems.

Subsystem	Area	Indicator code	Indicator
Social economy subsystem	Economic scale	C1	Per capita GDP
		C2	Economic density
		C3	Per capita income
		C4	Per capita trade volume
		C5	Per capita investment in fixed assets
		C6	Per capita retail sales of consumer goods
	Economic structure	C7	The proportion of output value of primary industry
		C8	The proportion of output value of tertiary industry
	Economic performance	C9	Average salary of employees
		C10	Social labor productivity
Ecological environment subsystem	Resource level	E1	Per capita water resources
		E2; E3	GDP energy consumption per ten thousand yuan (RMB) per capita forest stocking volume
	Environmental pollution	E4	Per capita SO2 emission
	Environmental pollution	E5	Per capita COD emission
		E6	Per capita solid waste emission
		E7	The proportion of environmental investment in GDP
		E8	Comprehensive utilization of industrial solid waste
	Environmental protection	E9	Standard-reaching rate of industrial wastewater emission
	Environmental protection	E10	Standard-reaching rate of industrial dust emission
		E11	Standard-reaching rate of industrial SO2 emission