John Nye asks: “What measure of inequality do Kenworthy and Anderson wish to observe that would lead them to say ‘Ok. No more needs to be done’?”
My response: There is no such precise measure or amount, and in my view it would be silly to offer one. My judgment about whether I would favor reducing the existing level of income inequality is based on how much it has increased and why, what seems feasible (taking into account, among other things, prior levels of inequality and levels achieved by other countries), and what the benefits and costs of reducing the existing level might be.
I think this type of question, like the one I addressed in my previous post, distracts us from genuinely interesting issues related to inequality and redistribution (including the one raised by John in his initial comment, which I hope to say something about in a future post).