Did I say mandatory? I meant optional! You’re “free” to die in a cardboard box under a freeway as a market capitalist scarecrow warning to the other ants so they keep showing up to make us more!
I think you’re conflating average and mean. When it comes to income average is typically median, which does include billionaires but wouldn’t skew the data due to their inclusion.
Average and mean are the same thing (sum of everything divided by total number of things). Median is the middle number.