Australia

That would suggest almost all people are superficial, which doesn't track. Contributing factors to couples having more money (opportunities etc) are things like, one person can work longer hours, while supporting the other to upskill, therefore eventually bringing in a higher income. One person can do school drop offs, the other pick ups, therefore offering less impact on one individual job spoiler, jobs are not child friendly, so needing to leave too often for a sick kid, can and does lose you a job. learning facilities, arr similarly not child friendly, your access is hugely lowered, to which, if any, courses you can study, without significant informal (free support) child care. Actual child care centres are unbelievably expensive, to the exclusion of most single parents. And that's not even counting sharing the other typical living costs. Being single has become a huge barrier to climbing the ladder.