Is epistemic inconsistency a mere symptom of having violated other requirements of rationality-notably, reasons-responsiveness requirements? Or is inconsistency irrational on its own? This question has important implications for the debate on the normativity of epistemic rationality. In this paper, I defend a new account of the explanatory role of the requirement of epistemic consistency. Roughly, I will argue that, in cases where an epistemically rational agent is permitted to believe P and also permitted to disbelieve P (relative to a body of epistemic reasons), the consistency requirement plays a distinct explanatory role. I will also argue that such a type of permissiveness is a live possibility when it comes to rational epistemic standards.
Keywords Rationality • Consistency • Epistemic reasons • Requirements • PermissivenessLinda believes that P and she also believes that ~P. She displays a kind of epistemic irrationality-she is inconsistent. Here is how we can define the requirement she violates:Consistency: Rationality requires that, if A believes that P at time t, A does not believe ~P at time t. Now, why is Linda irrational? Does her violating Consistency explain why she is irrational? Perhaps her inconsistency is just a symptom or a by-product of her having violated other requirements of epistemic rationality. Indeed, there are two main explanations of why Linda is irrational: