Sex discrimination in employment persists and is reflected in the increasing gender gaps in earnings, hiring and promotion to the management level (Chi and Li, 2014). Achieving more equal relations within the household is crucial to the attainment of gender equality since women's lives are often structured around their responsibilities as mothers and wives. Becker (1981), in particular, developed a unitary household model which argued that men and women specialize in market work and household work respectively based on comparative advantage.