The problem of peer disagreement concerns itself with the rational requirements for belief revision when disagreeing with an intellectual equal. A seemingly straightforward problem, one that we encounter almost daily, is in fact incredibly perplexing. Peer disagreements are problematic because of the conflicting intuitions that arise: that two individuals with the same probability of reasoning correctly with respect to the evidence should be given equal epistemic weight, and, that there are plenty of disagreements between intellectual equals that warrant one in preferring her own belief over...