Equation (1) (GDP)

Beta

Coef.

Std. errors

Z

P-value

GDP

1

imports

0.040

0.191

0.21

0.832

Exports

−2.003***

0.229

−8.71

0.000

Constant

2.50e+09

Equation (2) (IMPORTS)

Beta

Coef

Std. errors

Z

P-value

Imports

1

Exports

−49.47***

5.870

−8.43

0.000

GDP

24.69***

3.367

7.33

0.000

Constant

6.17e+10

Equation (3) (EXPORTS)

Beta

Coef.

Std. errors

Z

P-value

Exports

1

Imports

−0.020

0.094

−0.21

0.831

GDP

−0.499***

0.065

−7.62

0.000

Constant

−1.25e+09