> I've never understood using income inequality as a measure of the health of a society.
Relative deprivation is empirically shown to be a significant source of disutility. Further, even if only absolute deprivation is held to be significant, aggregate statistics don't show you the degree to which that is present in a society without distributional measures. Either of these reasons, much less both together, make distributional measures important alongside aggregate measures.
> As Milton Friedman said, the only place where people are equal is in a prison and in the grave.
The “in a prison” part is obviously and flagrantly wrong, but even beyond that the observation is irrelevant to the discussion at hand. That some inequality will always exist in real societies does not mean degree of inequality is unimportant alongside other measures, just as the fact that some aggregate output will exist in real societies does not mean that the degree of aggregate output is unimportant.
Relative deprivation is empirically shown to be a significant source of disutility. Further, even if only absolute deprivation is held to be significant, aggregate statistics don't show you the degree to which that is present in a society without distributional measures. Either of these reasons, much less both together, make distributional measures important alongside aggregate measures.
> As Milton Friedman said, the only place where people are equal is in a prison and in the grave.
The “in a prison” part is obviously and flagrantly wrong, but even beyond that the observation is irrelevant to the discussion at hand. That some inequality will always exist in real societies does not mean degree of inequality is unimportant alongside other measures, just as the fact that some aggregate output will exist in real societies does not mean that the degree of aggregate output is unimportant.