This eye-popping chart on inequality is a slap in the face of America's middle class

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Why does the US economy still feel iffy to most Americans despite an eight-year economic expansion and historically low unemployment?

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Look no further than this eye-popping chart of income growth between 1980 and 2014 courtesy of Berkeley's elite-squad of inequality research, including Thomas Piketty, Emmanuel Saez, and Gabriel Zucman.

Featured in a recent blog from the University of Chicago's Booth School of Business, the graphic highlights just how stratospheric income growth has been for the very wealthiest Americans - and how stagnant, in contrast, wages have been for the rest.

That's not a typo on the top right. Incomes for the top 0.001% richest Americans surged 636% during the 24-year period. Wow.

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There's more. "The average pretax income of the bottom 50% of US adults has stagnated since 1980, while the share of income of US adults in the bottom half of the distribution collapsed from 20 percent in 1980 to 12% in 2014," writes Howard Gold, founder and editor of GoldenEgg Investing, in the Chicago Booth blog.

"In a mirror-image move, the top 1% commanded 12 percent of income in 1980 but 20 percent in 2014. The top 1% of US adults now earns on average 81 times more than the bottom 50% of adults; in 1981, they earned 27 times what the lower half earned."

Here's a link to the full paper for the academically inclined.