 Since the primitivist thinks that we cannot define fundamentality, one might wonder how it is that she can decide on what the fundamental entities are. In other words, what is our epistemic access to issues concerning fundamentality? A possible answer is that we proceed the same way as we do with other primitives in metaphysics. That is, by asking how the view that x is fundamental fits in our overall theory. How does it fare with regard to our other commitments? These are issues where theoretical virtues such as simplicity and explanatory power might be employed (for a related discussion, see Schaffer 2014). However, this is not the place to tackle the admittedly difficult epistemic questions surrounding metaphysical theories in general, or the criteria that are to be employed in theory-choice. The primitivist about fundamentality may have one more primitive in their overall theory, and this, of course, calls for justification. But conceiving of the fundamental as primitive is no more mysterious than conceiving of, say, naturalness or grounding as primitive. This is not to say that postulating naturalness or grounding as primitives wouldn’t also require some justification though.