Some of the best proof that the gender pay gap is mostly a parenting pay gap comes from innovative studies in Sweden and Norway comparing new mothers in same-sex relationships with those in heterosexual relationships. Ylva Moberg, from the Swedish Institute for Evaluation of Labour Market and Education Policy, shows that the impact on earnings for the birth mother is almost identical in both family types.37 Meanwhile, the nonbirth mothers in the lesbian couples show a similar earnings pattern to fathers in the heterosexual ones. Over time, the inequality seems to balance out in the lesbian
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