You'll want to be careful about what you measure. For example, we generally take Forbes as an authority on who's rich, but really rich people tend to be exclud

You'll want to be careful about what you measure. For example, we generally take Forbes as an authority on who's rich, but really rich people tend to be excluded from consideration, because Forbes can only measure certain kinds of wealth, and even when people's wealth mostly exists in that form, it can be hard to see. Don't confuse a convenience metric with actual inequality.