Between 1951 and 2001, the top quintile was the only grouping that saw a substantial increase in its share of the national income.

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Quizplus · Accepted Answer

This is true, as noted in a 2013 report by the Congressional Research Service. The top quintile saw its share of national income increase from about 43% in 1951 to almost 50% in 2001, while the bottom four quintiles saw a decrease in their share.

Between 1951 and 2001, the Top Quintile Was the Only