The source report that the article is about has a lot more data and explanations: http://www.pewsocialtrends.org/2016/05/11/americas-shrinking-middle-class-a-cl

The source report that the article is about has a lot more data and explanations: http://www.pewsocialtrends.org/2016/05/11/americas-shrinking-middle-class-a-close-look-at-changes-within-metropolitan-areas/ http://www.pewsocialtrends.org/2016/05/11/americas-shrinking...