What historical change led to a devaluation of women's work in the home?

The industrial revolution changed the social and financial estimation of unpaid "housework." Although a great part of the real work that ladies performed in the "local circle" continued as before over the nineteenth century-cooking, cleaning, looking after kids, keeping up family social connections, and generally dealing with the family unit economy-socially it lost a lot of its previous esteem. As one student of history has put it, the "sexual orientation division of work" that once existed gradually turned into "a gendered meaning of work": men earned wages outside the home ("work"), and ladies did unpaid work ("not work") inside it.