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Wealth inequality in the USA, 1979-2005:
http://bp0.blogger.com/_JY-rIL8plNM/R2LwtDQkPLI/AAAAAAAAAC0/aOXk34r-YGo/s1600-h/Slide4.JPG
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Oops I'm off-topic.
That's a chart of the increased concentration of wealth.
Totally unrelated to today's topic, the increased concentration of political power.