Table 1. Summary statistics for variables.

Variable	Observations	Mean	Sd	Min	Max
lnEX	4275	13.064	2.196	2.031	19.043
Digit	4275	0.045	0.079	0.000	0.875
lnTFP	4275	0.963	0.207	0.132	2.031
fdi	4275	1.850	1.962	0.000	20.518
is	4275	38.969	9.660	8.580	83.520
grp	4275	0.367	0.188	0.030	1.980
lnhr	4275	1.672	0.561	0.086	4.070
lnrd	4275	0.490	0.545	0.010	4.287