Nowadays, it is thought that there are only two approaches to political economy: public finance and public choice
however, this research aims to introduce a new insight by investigating scholastic sources. We study the relevant classic books from the thirteenth to the seventeenth centuries and reevaluate the scholastic literature by doctrines of public finance and public choice. The findings confirm that the government is the institution for realizing the common good according to scholastic attitude. Therefore, scholastic thinkers saw a common mission for the government based on their essentialist attitude toward human happiness. Social conflicts and lack of social consent are the product of diversification in ends and desires
hence, if the end of humans were unified, there would be no conflict of interest. Accordingly, if the government acts according to its assigned mission, the lack of public consent is not significant. Based on the scholastic point of view this study introduces the third approach to political economy, which can be, consider an analytical synthesis among classical doctrines.