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Prior to 1940, the affluent and the middle class began to converge, but after 1979, the economic gap between the middle class and affluent widened significantly.

"William Julius Wilson: Ending Poverty Is Possible". "Tell Me More" with Michel Martin, www.npr.org. September 13, 2012.
Prior to 1940, the affluent and the middle class began to converge, but after 1979, the economic gap between the middle class and affluent widened significantly.