A similar analysis might be applied along the dimension of age, following the recent observations, in several places, that despite (for example) Warren Buffett's riches, few 20-year-olds would want to switch places with him. 60 years of life is worth more than $60 billion dollars, to most people, so every 20-year-old is in some sense "richer" than Buffett.

So should strict egalitarians tax the young more than the old? (Don't worry, it'll even out over a lifetime!)