And yet, there are many situations in which an observer does in fact look at two groups of people and claim that group A is better off than group B. On your view, are all such observers unjustified in all such claims, or are some of them sometimes justified? (And, if the latter, is there any reason we can't affect the world so as to create such a situation, wherein we are justified in claiming that people are better off after our intervention than they were before?)