After completing the rigorous requirement and the common core, students can choose to concentrate in Philosophy, Political Science or Economics. Such concentration entails choosing 5 suitably upper level courses in the subject, accompanied by two suitable courses in each of the remaining two PPE subfields.
PPE strives to be flexible in accomodating intellectual interests of the students, without compromising on the foundations of a subject. Students may substitute upto 3 courses from outside Econ,PSCI and Philosophy amongst the 9 credits needed for fulfilling the requirements for the concentration and subfields. The substitutions need to be judiciously chosen so that they are consistent with the students' primary field of specialization within the major. For example, a person choosing to concentrate in Economics may substitute PHIL courses in the subfield with courses from Wharton that have a philosophical perspective (for example, LGST 210: Corporate Ethics) and PSCI courses in the subfield with those taken in the Law School (for example, Law 607 -Antitrust Law). Some examples are provided in the pages linked above. Please keep in mind these are only examples and not suggestions.
Students should note that the Econ department imposes mathematical pre-requisites for its upper division courses. These mathematical requirements are therefore also necessary for anyone specializing in Economics within PPE. For those not specializing in Economics, the subfield requirements of Economics may be fulfilled with lower level courses.