Alana Semuels, The Atlantic, Aug. 9, 2015, available here

The number of people living in high-poverty areas—defined as census tracts where 40 percent or more of families have income levels below the federal poverty threshold—nearly doubled between 2000 and 2013, to 13.8 million from 7.2 million, according to a new analysis of census data by Paul Jargowsky, a public-policy professor at Rutgers University-Camden and a fellow at The Century Foundation. That’s the highest number of Americans living in high-poverty neighborhoods ever recorded.