Explanationism provides the best explanation of the epistemic significance of peer disagreement

In this paper, I provide a novel explanationist framework for thinking about peer disagreement that solves many of the puzzles regarding disagreement that have troubled epistemologists over the last two decades. Explanationism is the view that a subject is justified in believing a proposition just in case that proposition is part of the best explanation of that subject’s total evidence. Applying explanationism to the problem of peer disagreement yields the following principle: in cases of peer disagreement, the thing that the subjects ought to believe is the thing that is the best explanation of their total evidence, where part of their evidence is the fact that they happen to find themselves in disagreement with an epistemic peer. In what follows, I show how to understand and apply this core idea.