(1)

(2)

(3)

(4)

vrs

vrs

vrs

vrs

Model

Firm size

0.0465***

0.0548

−2.648***

−4.233

(2.83)

(1.28)

(−3.32)

(−1.15)

Firm size^2

−2.77e−11

20.65

(−0.21)

(0.44)

Fdi

4.66e−08

4.61e−08

4.35e−08

4.11e−08

(1.55)

(1.52)

(1.45)

(1.35)

Dependence on trade

0.581***

0.582***

0.494***

0.492***

(6.32)

(6.32)

(5.52)

(5.49)

Urbanization

0.00461*

0.00452*

0.00492*

0.00492*

(1.74)

(1.69)

(1.92)

(1.92)

Government behavior

0.0664

0.0675

0.126

0.124

(0.84)

(0.85)

(1.60)

(1.57)

Education

0.000178**

0.000177**

0.000156*

0.000160*

(2.08)

(2.05)

(1.82)

(1.85)

_cons

0.674***

0.671***

0.802***

0.829***

(13.69)

(13.02)

(12.95)

(9.51)

sigma

_cons

0.142***

0.142***

0.141***

0.141***

(21.87)

(21.86)

(21.85)

(21.85)

N

450

450

450

450