Our fourth model is the one with more variables, our first 3 explanatory variables are all
significant at 1% but since FDI and PPP are insignificant alone, we are going to check if they are jointly
significant. Since as you will see in the next section the two variables are jointly significant we keep them
in our model. Our R-squared in our last model is 0.46, it has increased from the previous model. Below
in the Appendix the STATA result for our final (4’) Model.