T-Dub sends in this quiz:
The start of growth in income inequality coincides with what historical event?
ANSWER: dbbeebs and DooDoo Economics nailed it. In 1971, President Nixon, an admitted Keynesophile, took the dollar off the gold standard and turned it into a pure fiat currency managed by the propeller-heads at the Dirty Fed.
For more on how Fed money-printing creates asset inflation for the rich and food and energy inflation for the poor, please see January 2011's Government-sponsored income inequality in the U.S.
P.S. Note that the exact same time is when commodities went Full Retard and hourly wages decoupled from productivity.