Why are married women working so much?

We study the large observed changes in labor supply by married women in the United States over 1950-1990, a period when labor supply by single women has hardly changed at all. We investigate the effects of changes in the gender wage gap, technological improvements in the production of nonmarket goods and potential inferiority of these goods on understanding this change. We find that small decreases in the gender wage gap can explain simultaneously the significant increases in the average hours worked by married women and the relative constancy in the hours worked by single women, and single and married men. We also find that technological improvements in the household have-for realistic values-too small an impact on married female hours and the relative wage of females to males. Some specifications of the inferiority of home goods match the hours patterns, but have counterfactual predictions for wages and expenditure patterns.Labor supply ; Women - Employment