Matt Freedman, a professor of economics at the University of California, Irvine, said that based on his reading of Clyburn's plan it could affect 20 million to 30 million people nationwide. These persistent-poverty communities are mainly clustered in the Deep South, Appalachia and on Native American reservations. "The structure of 10-20-30 is very straightforward and easy to understand by both policymakers and the public," he said in an interview.

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