This is the total purchasing power by income bracket. The top two brackets don't usually consume nearly as much of their purchasing power as other brackets (if you make 20k/y you spend everything, if you make 200k/y you save a LOT more).
Economically speaking, $ are meaningless: what is important is how often $s change hands over a period of time (say a year).
If you give people that spend 100% more money, then that money will move around much faster, becoming many more $/y in our economy. When you give money to people that save their marginal dollar, then it becomes many fewer $/y in our economy.
Further people that save reduce the interest rate, increase spending on capital goods, and overall increase employment. People that spend 100% make the prices of those resources marginally demanded by those that spend 100% go up in price.
Within a "J curve" of limits: Increase minimum wage is a recipe for inflation, lower taxes on those that will save their money is a recipe for greater employment.
Being a communist this makes me sad, and I think we should re-do the whole fucking system so this isn't the case any more: but that doesn't change the underlying economic reality given our existing system.