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To measure economic homogamy, i explore spouses’ annual earnings together with correlation coefficient due to the fact an excellent way of measuring the brand new connection anywhere between spouses’ money. Most other actions away from connection out of record-linear activities reveal fashion similar to people showed right here (come across on the internet appendix, Contour A1). Annual income try modified to own rising cost of living in order to 2012 cash utilizing the user price index (CPI-U) (Crawford and you may Church 2014) and you will greatest coded continuously across every years to get rid of strategies out of inequality and homogamy struggling with alterations in surveys’ best-programming plans. Following Burkhauser et al. (2004), we impose a premier password equivalent to the maximum part of the new husband-partner shot that have most useful-coded income on March CPS within the yearly; a maximum of step three% out of husbands had their money most useful coded, while

in which r is the relationship ranging from spouses’ money, t was seasons, we is the time because the earliest birth in years, and you can w is the proportion of partners from the day we from inside the year t. In the Eq. (1), r ? t reconstructs the fresh cross-sectional correlation pattern due to the fact good adjusted mediocre away from correlation coefficients across the groups. For the Eq. (2), roentgen t ? quotes the counterfactual relationship pattern that will be seen in the event the income contacts just before parenthood hadn’t altered since 1968 (or since 1969 first birth cohort); roentgen t we ?