Lead author Oren Cass distills it as follows: "In 1985, the typical male worker could cover a family of four's major expenditures (housing, health care, transportation, education) on 30 weeks of salary," he wrote on Twitter last week. "By 2018 it took 53 weeks. Which is a problem, there being 52 weeks in a year."
(via This chart is the best explanation of middle-class finances you will ever see - The Washington Post)