  There are several reasons to think about the significance of peer disagreement beyond its intrinsic appeal. First, considering the idealized cases of peer disagreement helps to isolate the epistemic significance of the disagreement itself. By controlling for other epistemic factors, cases of peer disagreement help us focus on what epistemic effects discovered disagreement has. While in non-idealized cases this is but one factor in determining what to believe, the debate about peer disagreements attempts to help us better understand this one factor. Second, while peers may be quite rare, as we have noted above, it is often not clear which party is in the better epistemic position. For instance, while it is quite rare for two individuals to be the exact same weight, it can often be unclear which individual weighs more. These unknown cases may have the same epistemic significance as peer cases. If what is needed is a positive reason to privilege one’s own view, as opposed to positive reasons to think that the other is a peer, then unknown cases should be treated like peer cases.