Explanatory variables | Index | Indicator meaning | Expected relationship |
The level of economic development | Lngdp | The per capita gross national product | Positive correlation |
Infrastructure | Lninfrast | The per capital area of road pavement | Positive correlation |
The degree of development of trade | Lntransp | The import and export volume | Positive correlation |
Labor cost | Lnwage | The average wage | Uncertain |
Tax factors | tax | Tax incentives index | Positive correlation |