Final answer:
The information provided does not specify an exact percentage for women's unpaid household labor. The existing discrepancy in pay and household responsibility heavily affects economic outcomes for women.
Step-by-step explanation:
The percentage of women's unpaid household labor is not precisely quantified in the provided materials. However, it's established that women bear a significantly larger portion of household responsibilities, and this unpaid labor contributes to the gender pay gap and women’s economic stratification. In the context of the United States, women, especially those with families and children, tend to be paid less than their male counterparts. This is complemented by the fact that on an average day, a larger percentage of women engage in household management activities compared to men.