The L-Curve graph represents income, not wealth
If we divided the income of the US into thirds, we find that the top ten percent of the population gets a third, the next thirty percent gets another third, and the bottom sixty percent get the last third. If we divide the wealth of the US into thirds, we find that the top one percent own a third, the next nine percent own another third, and the bottom ninety percent claim the rest. (Actually, these percentages, true a decade ago, are now out of date. The top one percent are now estimated to own between forty and fifty percent of the nation’s wealth, more than the combined wealth of the bottom 95%.)