@fmf said
If some people are better at creating income, then I think uneven levels of wealth would be "fairness of outcome". Outliers and extreme examples aside, I wonder what the "wealth gap" is in the societies with the least income equality? I also wonder how a society should best go about deciding what "fair" financial and personal contributions to the collective endeavours and arrangements would be.
Well, maybe. There are valid reasons for unevenness of wealth, such as superior skill, and even dumb luck [say, one guy strikes oil while his neighbor does not]; while there are also invalid reasons for such unevenness, such as racial/gender discrimination, unfair laws, government corruption, etc.
Here's a an article from good ol' Wikipedia with a nice map of income inequality across the nations:
https://en.wikipedia.org/wiki/List_of_countries_by_income_equality
Interestingly, the worst cases are in Africa, South America, and Saudi Arabia, while the the best are predominantly northern countries. Bad governments tend to worsen equality, while less populous, colder nations have an easier time improving equality.
The graph does not, however, indicate the weighted impact of wealthier nations. The middle-range income inequality in the USA and China, for example, has got to impact the pie chart more heavily than other countries, just because those two economies are the biggest.