If you want to convince people that the communist economic model is better than the Western one, thinking in terms on median income instead of mean income as important helps.
Income (and wealth) in societies tends to be distributed according to a power law. That makes the mean a bad estimator regardless of your ideology. The Western economic literature almost universally uses the median when discussing income and wealth comparisons.
Given that the utility of money is (assumed to be) logarithmic, what I'd be curious to know is the geometric mean income of countries.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.