As for the graph, is there any info on the wealth markers for each 20 percent? At that range we're talking blocks of 60 million people. The richest 5 percent of Americans control between 35 to 40 percent of total wealth, so while still quite well off, there's still a vast gap in control of wealth between the top 15 million and the other 45 million in the first 20 percent.
I know $180,000 is the threshold for the top 5 percent of earners, would be interested to see where that's at for wealth.