Table 7.

National environmental protection supervision and control and psm-did regression results of corporate production efficiency

Variable	lntfp
CEPI	0.034**
	(2.33)
Size	0.534***
	(23.96)
Debt	0.209***
	(3.19)
Roa	0.205***
	(3.00)
TobinQ	0.015***
	(3.57)
Capital	− 0.016***
	(− 2.59)
Market	0.015
	(0.94)
Firm fixed effect	Yes
Year fixed effect	Yes
N	12,745
$R^2$	0.662

t statistics in parentheses, ^* p < 0.1, ^** p < 0.05, ^*** p < 0.01