Here's two [1,2]. There are plenty more you can find with a Google search. [1] http://www.aei.org/publication/yes-the-us-middle-class-is-shrinking-but-its-beca

Here's two [1,2]. There are plenty more you can find with a Google search. [1] http://www.aei.org/publication/yes-the-us-middle-class-is-shrinking-but-its-because-americans-are-moving-up-and-no-americans-are-not-struggling-to-afford-a-home/ http://www.aei.org/publication/yes-the-us-middle-class-is-sh... [2] https://www.washingtonpost.com/opinions/is-the-middle-class-moving-up/2016/06/24/214dc04a-3a28-11e6-8f7c-d4c723a2becb_story.html?utm_term=.19fe8be489f5 https://www.washingtonpost.com/opinions/is-the-middle-class-...