	(1)	(2)	(3)	(4)
	yizhi1	yizhi2	yizhi3	yizhi4
VARIABLES	lnexport	lnexport	lnexport	lnexport
				
treat_year03	0.1027	0.1060	0.2372*	0.2367*
	(0.0634)	(0.0650)	(0.1280)	(0.1280)
lnage	0.2032***	0.2040***	0.1671***	0.1706***
	(0.0367)	(0.0381)	(0.0574)	(0.0573)
lnsize	0.5854***	0.5900***	0.3970***	0.4043***
	(0.0266)	(0.0266)	(0.0504)	(0.0574)
lnlabor	0.1701***	0.1780***	0.0870***	0.0951***
	(0.0157)	(0.0164)	(0.0317)	(0.0361)
profit	0.8790***	0.8600***	0.6129***	0.6458***
	(0.0677)	(0.0724)	(0.2234)	(0.2419)
lngdp	0.0497*	0.0566**	-0.0219	-0.0242
	(0.0257)	(0.0266)	(0.0284)	(0.0296)
openness	0.0713	0.1254	1.3556	1.5777
	(0.0449)	(0.1120)	(0.9206)	(0.9674)
lnpeople	-0.0711*	-0.0767*	-0.2677	-0.3250
	(0.0405)	(0.0412)	(0.2750)	(0.3123)
lnrailway	0.0872	0.0979	0.6392**	0.6562**
	(0.1060)	(0.1072)	(0.2710)	(0.2808)
lnhighway	-0.2826**	-0.2919**	-0.0405	-0.0473
	(0.1176)	(0.1207)	(0.2211)	(0.2206)
Constant	8.6757***	8.5282***	5.2457	5.4331
	(1.4212)	(1.4356)	(3.2223)	(3.3500)
				
Observations	111,853	104,064	16,943	15,880
R-squared	0.813	0.813	0.779	0.779
Robust standard errors in parentheses				
*** p<0.01, ** p<0.05, * p<0.1				
