Econlog: The Marriage Premium
Despite clear lifetime expected earning premiums (44% for men), economists are hesitant to encourage marriage at the policy level according to Bryan Caplan. By comparison, the college premium is touted by economists and frequently explored in economic literature.
My guess, the reluctance to promote marriage comes from a combination of two sources. 1) People are hesitant to marginalize single mothers. 2) Supporting marriage is widely viewed as an outdated position in the modern world given the implications for women and traditional gender roles.
With national marriage rates falling, however, there is an opportunity for a greater emphasis of study on family economics and the role of marriage in society.