  With this bit of background in place, the idea that transfers of resources from better off to worse off persons are sometimes morally desirable can be understood without supposing either that equality of any sort is per se desirable or that there is some level of well-being that marks the good enough level and that has a special status as specified by the sufficiency doctrine. Suppose that for any person, the lower her lifetime well-being score—the amount of well-being she gains or is now expected to gain over the course of her life—the more morally valuable it would be to secure an incremental gain of well-being for her (or to avoid a small loss). This is the root idea of prioritarianism.