Why does one cares about the relative wealth of another individuals versus our own, especially in a system where people can mutually gain from exchanges? If anything, one should be concerned about one's own absolute wealth over time, not one's relative wealth to another.
Are you kidding?
In a market based society there is only relative wealth. Bill Gate is not rich because he has 40 billion dollars. He is rich because we all don't have 40 billion dollars. If we did all did the "average" house would cost 100 billion dollars and we'd all still have mortgages.