Income Inequality and Tax Rates
Slate has a very good series of articles about income inequality and the fate of the middle class in America:
http://www.slate.com/id/2267157/
I think they are leaving out something very important.
American top marginal tax rate:
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Even though that paints an incomplete picture of tax burden, the correlation between the tax rate and the ‘great divergence’ of classes in the US is hard to miss.
Then there is this one – American tax rates since 1960, showing an increase in taxes on the middle class and a drastic decrease in taxes for the wealthy:

Basically, either intentionally or by accident the middle class was engineered out of existence.