this is fascinating. http://review.chicagobooth.edu/economics/2017/article/never-mind-1-percent-lets-talk-about-001-percent
Very interesting. The article did seem a bit biased towards the ultra-rich, to me, and I'm not sure I agree with the dichotomy they end with:
"Do we slow the 0.01 percent or lift the 99.99 percent" -- why not both?