It turns out there is a mathematical formula for determining the ideal number of billionaires in a society if you want to promote general wellbeing, health, community safety, etc. It's a little complicated, but here it goes:
• let A be the annual GDP of the population
• let B be the median wage of people over the age of 34
• let C be the average annual cost of housing *per person*
• let D be one standard deviation of the population age
• let X be the ideal number of billionaires
X = 0
This formula is very robust, surprisingly, and scales across all nations and economies that have ever been known to humankind. Really fascinating stuff!