The Brookings Institution article is linked below.
The Brookings Institution: 12 Things to Know About the Embattled Segments of the American Middle Class
"Compared to families living in poverty, families in the struggling lower-middle class are more likely to be headed by a married couple, to have a second adult worker, and to be headed by an individual with some college education. Those in the struggling lower-middle class still face many of the same challenges as those in poverty, however, including food insecurity and a reliance on government programs for income support."
---Benjamin H. Harris and Melissa S. Kearney, The Brookings Institution