What other property of income id important in comparing two or more societies?

Question

What other property of income id important in comparing two or more societies?

Answer 1

average income (per capita) and income distribution.

distribution is important b/c one super-rich person plus a bunch of poor people will have same average as a bunch of middle-income people.

Answer 2

Income distribution (expressed by Gini coefficient and Lorenz curve)

Average income per capita

Real income instead of nominal

Price level