 This last response brings out the fact that a proponent of MMR needs a clear specification of that to which truth is relative. For example, if S is true-relative-to the moral code of a society, does this mean it is true-relative-to what people in the society think the moral code says or to what the fundamental standards of the moral code actually imply? These might not be the same. It is often supposed that truths can be undiscovered or that people can make mistakes about them. As just noted, a moral relativist could make sense of this by supposing that it is the fundamental standards of a moral code that are authoritative for people in a society that accepts that code. Hence, what is morally true-relative-to the moral code of a society is whatever the fundamental standards of the code would actually warrant. By this criterion, there could be moral truths that are unknown to people in the society that accepts the code, or these people could be mistaken in thinking something is a moral truth.