(1)

(2)

(3)

(4)

Digital.L

0.490***

0.185***

(13.72)

(3.53)

Digital.L2

0.396***

0.221**

(9.78)

(2.02)

GDP

0.000***

0.000

(4.66)

(0.55)

Urban

0.254***

0.380***

(3.79)

(3.37)

Agricultural

0.039

0.031

(0.49)

(0.38)

常数项

0.077**

0.230***

0.020

(2.54)

(9.34)

(0.33)

Observations

120

120

90

90

Number of AREA

30

30

30

30