A new study found that male earnings have generally declined, while female earnings have generally increased. The authors of the study argue that the lower number of two-parent households is a reason for the decline in male salaries. The author says that there is evidence that men raised by single mothers do worse in the labor market than those raised by two-parent households. Men still make more than women, but economists are not able to explain why the gap has shrunk. Some point to the fact that women are more likely to attend and complete college than men, and that men were more effected than women by the decline in manufacturing. However, there is no conclusive evidence or consensus on the reason for male salaries declining overall.
See "Study of Men's Falling Income Cites Single Parents", Binyamin Appelbaum, The New York Times, March 20, 2013