FWIW not on income but on top wealth, Musk has $792 Billion (ffs...) so ~$1000B and we are 8.4B Earthlings so ~10B. If we were to spread equality his wealth (which I'm all for) it would "only" gives each of us ~$100. Conclude from that what you will but to me it's just a reminder of just how many people we are. A lot.

PS: this isn't about income and it might be totally different there. If you have a better metric and approximation I'd be all ears.