Instrumental variable (2SLS)
| Variables | Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | Model 6 |
|---|---|---|---|---|---|---|
| First | Second | First | Second | First | Second | |
| FTs | innovation | CTs | innovation | GPTs | innovation | |
| Post office | 37.657*** (6.473) | |||||
| FTs | 0.935*** (0.040) | |||||
| Telephones | 115.187*** (13.179) | |||||
| CTs | 0.997*** (0.032) | |||||
| Post output | 88.500*** (17.780) | |||||
| GPTs | 1.415*** (0.151) | |||||
| Observations | 1,284 | 1,284 | 1,284 | 1,284 | 1,284 | 1,284 |
| R-squared | 0.909 | 0.817 | 0.635 | |||
| Control | Yes | Yes | Yes | Yes | Yes | Yes |
| City FE | Yes | Yes | Yes | Yes | Yes | Yes |
| Year FE | Yes | Yes | Yes | Yes | Yes | Yes |
| Variables | Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | Model 6 |
|---|---|---|---|---|---|---|
| First | Second | First | Second | First | Second | |
| FTs | innovation | CTs | innovation | GPTs | innovation | |
| Post office | 37.657*** (6.473) | |||||
| FTs | 0.935*** (0.040) | |||||
| Telephones | 115.187*** (13.179) | |||||
| CTs | 0.997*** (0.032) | |||||
| Post output | 88.500*** (17.780) | |||||
| GPTs | 1.415*** (0.151) | |||||
| Observations | 1,284 | 1,284 | 1,284 | 1,284 | 1,284 | 1,284 |
| 0.909 | 0.817 | 0.635 | ||||
| Control | Yes | Yes | Yes | Yes | Yes | Yes |
| City | Yes | Yes | Yes | Yes | Yes | Yes |
| Year | Yes | Yes | Yes | Yes | Yes | Yes |
***p < 0.01
Sharing content requires targeting cookies to be enabled. Please update your cookie preferences to use this feature.