I think there's a lot to be said about an idea like "concentrated prosperity". It doesn't mean much to prosper alone. Think about all of the choices afforded to you if others around you also prosper. If more people around you have more time for leisure, for instance, there's more time for valuable growth in other areas, like arts or understanding. So I don't think richness comes about to us if we alone succeed, I think richness finds us based upon how competent we become and then enable others around us to be.