I can't remember who it was that did their presentation on HNWIs, but it got me interested in it and I did some research on HNWIs and billionaires for my most recent podcast episode. It's nothing major, mostly doing calculations on data pulled from the World Wealth Report and the Wealth-X Billionaire Census, but there's some very interesting figures:
https://docs.google.com/spreadsheets/d/ ... 1533461741
Most interesting to me are the millionaire and billionaire rates, calculated as the number of millionaires per hundred thousand people and number of billionaires per million people. The differences in billionaire rates are even more stark when looking at them differentially (I used the ratio of billionaires per million for the country to billionaires per million for the world). I also created an "inequality score" based on the differential millionaire/billionaire rate and differential GDP per capita (could probably be improved with median HH income or something).
The most surprising country to me is Hong Kong, which has over 31x the global billionaire rate, and billionaire wealth is 70% of GDP (again, this calculation could benefit from something other than GDP, but I'm not sure what would be better in this case).
I also looked at the billionaire population by race, using billionaire rate by continent as an approximation. Doing a quick search just now, it seems like even the incredibly low number of 44 black billionaires from my approximation may be a drastic overestimate.