Mason's PPE program is a concentration, meaning that it is something students pursue within the context of a traditional major. There are four options: the BA in Philosophy, the BA in Government and International Politics, the BA in Economics, and the BS in Economics.
No matter what a student's major, the PPE program is structured in the same way. It combines traditional courses in each of the three disciplines with a set of core courses that cover topics in the intersection of philosophy, political science, and economics, and which adopt a robustly interdisciplinary approach. The program culminates in a capstone course that integrates insights from the entire program.
The following image illustrates the structure of the program. (Click on the image for a larger version.)
The links on the left identify requirements specific to the concentrations in each of the four majors.