The difference between the graphs are that the one linked by jusmus88 is illustrating the distribution of incomes of "families", whereas all three in the articl

The difference between the graphs are that the one linked by jusmus88 is illustrating the distribution of incomes of "families", whereas all three in the article you linked are for the distribution of incomes of "households". These are two different ways of analysing the issue that give different answers, and the differences are discussed in the article. edit: Just to be clear, I'm not making any positive or negative statements about the article, I just wanted to help you work out what it was you had missed, and I think what I described is it.