This study in Turkey created a model to understand how different ways of paying for transportation projects affect the economy. They looked at three ways to finance projects: using public money from taxes and government bonds, using taxes specific to regions, or private funding. By using this model, they could see the impact of each financing method on economic growth and how it affects people's well-being. The study found that these financing options can influence both growth and how benefits are distributed. Overall, the research shows that the way transportation projects are funded can have significant effects on the economy and people's lives.