 One of the most important questions at stake is whether it must always be true, for two states of affairs, that things would be better if the first obtained than if the second did, that things would be better if the second obtained than if the first did, or that things would be equally good if either obtained. The claim that it can sometimes happen that none of these is true is sometimes referred to as the claim of incomparability, in this case as applied to good simpliciter. Ruth Chang [2002] has argued that in addition to “better than”, “worse than”, and “equally good”, there is a fourth “positive value relation”, which she calls parity. Chang reserves the use of “incomparable” to apply more narrowly, to the possibility that in addition to none of the other three relations holding between them, it is possible that two states of affairs may fail even to be “on a par”. However, we can distinguish between weak incomparability, defined as above, and strong incomparability, further requiring the lack of parity, whatever that turns out to be. Since the notion of parity is itself a theoretical idea about how to account for what happens when the other three relations fail to obtain, a question which I won’t pursue here, it will be weak incomparability that will interest us here.