It's easy to verify that married people make more money than unmarried people: https://bigthink.com/smart-skills/married-wage-gap/#:~:text=That%20married%20peop

It's easy to verify that married people make more money than unmarried people: https://bigthink.com/smart-skills/married-wage-gap/#:~:text=That%20married%20people%20make%20more,to%20be%20greater%20for%20men https://bigthink.com/smart-skills/married-wage-gap/#:~:text=.... It's easily verified by data you can find in many studies, and presumably the census itself. Of course it doesn't technically prove causality - it could be that the type of people who are successful just happen to be the same type of people who get married. Or maybe they get married precisely because they are successful - or unsuccessful people have a harder time finding spouses.