I recently came across an article on Time Magazine's website that was pretty interesting. According to a study completed by the Pew Research Center, married men have a 60% higher income than they did in 1970, whereas unmarried men only experienced an increase of 16% in income.
According to the study, one of the reasons that married men experienced a higher increase in income is because the percentage of men marrying women who earn as much, if not more, than they do has also increased since 1970. Coupled with this is the fact that there has been a dramatic increase in the number of white collar women.
Another interesting point was that there is a decrease in divorce among college educated couples, and an increase in divorce between non-college educated couples. Apart from the homogamy aspect of the studies, it was interesting to learn about correlation between income and duration of marriage.