ABSTRACT
Start with the obvious: Politics, Philosophy, and Economics (PPE) is an interdisciplinary undertaking. One way to think about how the three-component disciplines converge is to point out that they deal with contiguous, sometimes overlapping, substantive matters. I think it is also plausible to point out that the three disciplines converge not just around questions of what we know but, in important ways, about how we know and how we know it. Models are central to the way the three disciplines address those matters.
