Could I comment on that? I think one of the most clearly accepted economic justifications for women's economic equality is that women need to be developed to be as productive as men. This will indeed have beneficial impacts, not just on women and their dependants, but on everyone, men as well as women.
One of the measures of women's inequality is the total work index. It's on page 4 of this Status of Women document, if you want to look at that. Women do more work than men do in this economy, but men have the lion's share of the paid work, and women have the lion's share of the unpaid work. One of the goals of gender equality is to bring those into line. It's not just to give women as much income as men. It's to also make sure that women do a better mix of paid and unpaid work and that men do a better mix of paid and unpaid work, so that the population as a whole becomes healthier and more productive and so on. There are considered to be great benefits from making sure that women do not have to struggle on the economic margins.