Something very peculiar is going on at the top of the US wealth distribution

Inspired by the FT piece on the world's überwealthy, I decided to explore the very top of the US wealth distribution. Figure 1 displays the average net worths in constant 2016 dollars of the top 1 percent, 0.1 percent, 0.01 percent, and 0.001 percent of the wealthiest adults in the United States over the past 100 years. (All data that appears in this po…