His and hers earnings trajectories: Economic homogamy and long-term earnings inequality within and between different-sex couples

Economic homogamy has important implications for gender inequality and for economic inequalities between households. However, the long-term association between spouses’ earnings is not well understood. This study reconceptualizes economic homogamy as a life course process rather than a static state of being that can be adequately captured at a single point in time. Using data from the National Longitudinal Survey of Youth 1979, I examine the association between spouses’ earnings trajectories over the course of 30 years of marriage to identify three distinct gender egalitarian earnings patterns among couples. 50 % of couples follow a Dual earner pattern, in which spouses follow similar, stable earnings patterns over time, 6 % of couples are Jointly mobile in that spouses’ earnings vary similarly and 5 % follow an Alternating earner pattern. A large minority of couples follow patterns of long-term specialization, with 34 % of couples following Male breadwinner patterns and 5 % following Female breadwinner patterns. Multivariate analysis reveals that gender egalitarian earnings patterns are stratified by couples’ socio-economic status at marriage: while advantaged couples follow Dual earner patterns comprised of two stable earners, disadvantaged couples follow egalitarian earnings patterns characterized by joint earnings instability. By taking a long-term approach, this study provides insight into the varied ways gender equality in earnings manifests among married couples and reveals an important and understudied dimension of economic homogamy: the concentration of economic stability and instability within couples.