 It seems that the comparative criteria work well when we evaluate losses, such as the loss of my arms, and also when we evaluate some lacks, such as the inability to see or to feel pleasure. But, arguably, the criteria have worrisome implications when we evaluate certain other lacks, such as my lack of genius. It is relatively clear that a person is harmed by the inability to see but less clear that he is harmed by the lack of genius. Why is that?