Among men with post-secondary degrees in Sweden, one in four are childless by age 45, and this level has been constant over time (in this study, for men born [1956][1957][1958][1959][1960][1961][1962][1963][1964][1965][1966][1967][1968][1969][1970][1971][1972]. This high level of childlessness is somewhat surprising in the context of a significant gender imbalance among the highly educated (and thus the relative scarcity of highly educated men). In this study, I examine differences in childlessness among the highly educated by studying how educational prestige, social class, and income are associated with the likelihood of becoming a father. Higher income and social class background are positively associated with fatherhood, and this association has not changed over time. Educational prestige (higher degrees, or degrees from traditional universities) is not positively associated with fatherhood, while 2-year degrees have become more positively associated with fatherhood over time. The findings of this study suggest that socioeconomic resources are important for men's family formation in Sweden compared to educational resources, contrary to expectations from educational homophily and partner market perspectives.share of highly educated men remaining childless and/or single has remained steady or increased slightly across Europe over the last few decades (Becker and Jann 2017;De Hauw et al. 2017;Wiik and Dommermuth 2014).This persistence of rather high childlessness among highly educated men is at odds with predictions from theories of educational homophily and the partner market framework. Research on educational homogamy has shown that the highly educated tend to partner with each other. While opportunities play a role, the literature has stressed the importance of preferences for shared experiences, tastes, values, and intellectual orientation among the highly educated (Blossfeld ). The ability of highly educated men to find highly educated female partners has increased dramatically over the last decades. Whereas systems of higher education were previously dominated by men, they are now dominated by women in Sweden and most other OECD countries (Vincent-Lancrin 2008; UKA 2016). Highly educated men are increasingly scarce on the partner market due to gender inequality in higher education. Previous research suggests that groups which are "in-demand" on the partner market benefit in terms of union formation (Abramitzky et al. 2011, Lewis andOppenheimer 2000). Thus, relative scarcity should facilitate the formation of childbearing unions among highly educated men-yet highly educated men remain childless to a significant degree. Meanwhile, childlessness among highly educated women has decreased over this time period (Jalovaara et al. 2017 for the Nordic countries). Meanwhile, women in the Nordics and around the world (Esteve et al. 2012(Esteve et al. , 2016 increasingly "partner down" with men who have lower education than themselves.The aim of this study is to promote our understanding of childlessness by assessing ...