"Countries where income was more equally distributed tended to have longer growth spells," says economist Andrew Berg, whose study appears in the current issue of Finance & Development, the quarterly magazine of the International Monetary Fund.
So how important is equality? According to the study, making an economy's income distribution 10 percent more equitable prolongs its typical growth spell by 50 percent.
The authors aren't the first economists to suggest that income inequality can torpedo the economy. Marriner Eccles, the Depression-era chairman of the Federal Reserve (and an architect of the New Deal), blamed the Great Crash on the nation's wealth gap.
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