Albanesi, Stefania; Olivetti, Claudia - National Bureau of Economic Research (NBER) - 2007
Until the early decades of the 20th century, women spent more than 60% of their prime- age years either pregnant or … nursing. Since then, improved medical knowledge and obstetric practices reduced the time cost associated with women …'s reproductive role. The introduction of infant formula also reduced women's comparative advantage in infant care, by providing an …