Study: Highly educated Americans are most likely to take on unmanageable debt

What’s more, gross personal financial mismanagement occurred across the population and not just in the mortgage market and not just among the unsophisticated.

The study draws a line at the point where monthly payment on household debt equals 40% of income. That’s where default or bankruptcy becomes most likely should the household experience a decline in income, say researchers led by Sherman Hanna, professor of consumer sciences at Ohio State University.

Overall, the percentage of Americans exceeding this 40% threshold jumped to 27% in 2008, from 17% in 1992. College graduates were more likely to be in this group than those without a degree, according to the study. Those describing themselves as optimistic about the future also were among the most likely to have unmanageable debts, the study found.