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 pattern, in which spouses follow similar, stable earnings patterns over time, 6% of couples are in that spouses' earnings vary similarly and 5% follow an pattern. A large minority of couples follow patterns of long-term specialization, with 34% of couples following patterns and 5% following patterns. Multivariate analysis reveals that gender egalitarian earnings patterns are stratified by couples' socio-economic status at marriage: while advantaged couples follow 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.