 The fact that social groups are defined by different criteria, and that persons commonly belong to more than one social group, might be taken as a reason to move from relativism to a form of subjectivism. That is, instead of saying that the truth or justification of moral judgments is relative to a group, we should say it is relative to each individual (as noted above, relativism is sometimes defined to include both positions). This revision might defuse the issues just discussed, but it would abandon the notion of intersubjectivity with respect to truth or justification—what for many proponents of MMR is a chief advantage of the position. Moreover, a proponent of this subjectivist account would need to explain in what sense, if any, moral values have normative authority for a person as opposed to simply being accepted. The fact that we sometimes think our moral values have been mistaken is often thought to imply that we believe they have some authority that does not consist in the mere fact that we accept them.