| 高收入地区 | 低收入地区 |
envi | −0.123*** | 0.007 |
| (0.000) | (0.781) |
fee | 0.056*** | −0.036*** |
| (0.000) | (0.002) |
mark | 0.647*** | 0.245*** |
| (0.000) | (0.000) |
gc | −0.003 | −0.059*** |
| (0.165) | (0.000) |
gc2 | 0.000 | 0.002*** |
| (0.541) | (0.000) |
tech | 0.027 | −0.015 |
| (0.201) | (0.396) |
fdi | 0.033* | −0.009 |
| (0.062) | (0.36) |
_cons | −1.595*** | 0.395 |
| (0.004) | (0.214) |
Wald chi2(8) | 142.850 | 280.980 |
Prob > chi2 | (0.000) | (0.000) |