Different types of industrial agglomeration and green total factor productivity in China: do institutional and policy characteristics of cities make a difference?

Environmental Sciences Europe

Table 4 Regression results of system GMM

Variables	(1)	(2)	(3)
Variables	SysGMM	SysGMM	SysGMM
L.lnGML	− 0.252***	− 0.250***	− 0.255***
	(− 7.05)	(− 7.16)	(− 7.26)
lnLQ_MAN	0.046***
	(3.33)
lnLQ_PS8		0.047
		(1.37)
lnCOAG			0.168***
			(3.64)
lnPopDensity	− 0.005	− 0.001	− 0.005
	(− 0.73)	(− 0.16)	(− 0.66)
lnTaddSadd	− 0.037	− 0.060**	− 0.057*
	(− 1.47)	(− 2.22)	(− 1.94)
lnRegulation	0.187***	0.130**	0.223***
	(2.66)	(2.18)	(3.30)
lnSciEdu	− 0.037*	− 0.041**	− 0.031
	(− 1.77)	(− 2.09)	(− 1.57)
lnuF	− 0.004	0.002	− 0.003
	(− 0.85)	(0.60)	(− 0.77)
Constant	0.134	0.002	0.026
	(1.24)	(0.02)	(0.27)
Observations	3653	3653	3653
Number of cities	281	281	281
AR(1)	0.000	0.000	0.000
AR(2)	0.336	0.323	0.347
Hansen test	0.201	0.326	0.258
Wald	3026	3123	2965