The Numbers Come First
The ratio of college-educated men to college-educated women fell from 1.8 to 0.8 across U.S. birth cohorts spanning 1930 to 1980, according to a National Bureau of Economic Research working paper by economists Clara Chambers of Yale, Benjamin Goldman of Cornell, and Joseph Winkelmann of Harvard. Today, women outnumber men in four-year colleges by 1.6 million nationwide.
The paper, titled 'Bachelors Without Bachelor's: Gender Gaps in Education and Declining Marriage Rates,' finds that college-educated women have kept their marriage rates stable despite that shrinking pool of similarly credentialed men. The mechanism: they crossed the education line and married non-college men — but not randomly.
Skimming the Top
The share of marriages in which the wife holds a four-year degree and the husband does not has quadrupled, from 2.3% of women in the 1930 birth cohort to 9.6% in the 1980 cohort. College-educated women disproportionately paired with the highest earners among non-college men, whose average incomes rose from $61,400 to $68,400.
Non-college men who did not marry a college-educated woman moved in the opposite direction: their average earnings fell roughly $10,000, landing near $46,000. As college women absorbed the most economically stable non-degree men, the pool of 'marriageable' men available to non-college women dropped by half, the study found.
Researchers at the Institute for Family Studies have labeled the dynamic 'skimming' — college-educated women are not rejecting non-college men outright, but they concentrate among the most financially stable ones.
Labor Market Roots
Goldman told Fortune the pattern tracks the broader labor market shift of recent decades. Well-paying, often unionized manufacturing jobs once allowed men to build a solid living without a four-year degree. Fields that drew more women — nursing, teaching — increasingly required one, widening the credential gap over time.
'Four-year college rates for men stagnated essentially many decades ago, whereas for women, it's been a steady increase,' Goldman said. 'That's really been the key factor that's led to the changing ratio over time.'
Goldman cautioned that the paper examines market-level patterns, not individual motivations, and pushed back on reading a power imbalance into cross-education marriages, pointing to pairings like a nurse and a small-business owner or a well-paid electrician and an HVAC technician.
What It Means
The data puncture a popular media narrative — essays in outlets like The New Yorker and The Atlantic have proliferated around the difficulty highly educated women face finding partners. The NBER study's own figures show college-educated women are marrying at higher rates than any other group in the analysis.
The real story is further down the income ladder. Free markets sort efficiently, and the marriage market is no exception: scarce, high-earning non-college men have become a premium asset, bid up by a larger pool of college-educated women with stable incomes of their own. The cost of that sorting falls almost entirely on non-college men at the lower end of the earnings distribution — and on the non-college women who would otherwise have partnered with them.
For policymakers who claim to care about working-class family formation, the NBER paper offers a data-driven challenge: the credential gap driving these outcomes has been widening for decades, and no amount of cultural commentary reverses a labor market that stopped rewarding male workforce entry without a degree. Capital — human or financial — flows where the rules are clear and the returns are real.
