Per capita averaging is spectacularly bad way to talk about income in most contexts. If Bill Gates (or any other very high-income individual) walks into a room,

Per capita averaging is spectacularly bad way to talk about income in most contexts. If Bill Gates (or any other very high-income individual) walks into a room, average per capita income of everybody raises significantly, especially if it's a small room. Somehow, it is of no use to anybody.