This spiffy report from the Federal Reserve Bank of Minneapolis examines what has led to large numbers of married women choosing to work. If you can wade though the economics-speak, they find that married women are working more hours, and single women and men are working about the same hours, in the 1990’s as in the 195os. And the reason that married women are ramping up work time while everyone else stays the same? Drumroll, please.. . . . Because the gender wage gap has closed so dramatically. Ya see, between 1950 and 1990 wages for women rose so much faster than for other groups that their incentive to work grew faster as well. Well, waddya know.