This is actually a really interesting point. In some ways even moderatly poor people in a Western country are better of than the Caesars of Ancient Rome, especially the availability of medical care is something I would never want to trade. In other ways even the richest and most powerful people today will never be able to have comparable power, in terms of political and cultural influence. It would be an interesting excercise to come up with a definition of wealth that somehow accounts for this.