ip | (1) | (2) | (3) | (4) |
er | −0.270*** (0.046) | −0.245*** (0.046) | −0.203*** (0.043) | −0.195*** (0.042) |
rii | −2.607*** (0.533) | −2.541*** (0.521) | −2.373*** (0.485) | −2.161*** (0.469) |
fta | 0.001*** (0.0003) | 0.001*** (0.0003) | 0.002*** (0.0003) | 0.002*** (0.0003) |
er*rii | 8.091*** (2.057) | 7.701*** (2.028) | 6.784*** (1.919) | 5.536*** (1.831) |
er*fta | 0.001 (0.002) | 0.0002 (0.002) | −0.0002 (0.002) | 0.001 (0.001) |
er*rii*fta | 0.034 (0.038) | 0.055** (0.027) | 0.078*** (0.025) | 0.087*** (0.028) |
Control variable | control | control | control | control |
Time | control | control | control | control |
Product | control | control | control | control |