One thing is obvious to me, the idea that money trickles down is a total fallacy, it seems to pool at the top. The opposite is true, if you look at money movement, the money at the bottom changes hands with exponential frequency compared to the money at the top and has a multiplier effect on the economy as a whole.
I realize that the statistics this is pulled from only counts household incomes and does not count dependents and children and that makes the distribution even worse when you divide the incomes by household members, but that would make things much more difficult to calculate.
One fact that is left out is many of the poor and middle class families now require two working adults to earn the household income shown on the chart. Things are even worse then the chart depicts.