Question

why are there differences in value attached to the work of male and females

Answer 1

In a typical patriarchal  society , the women are tend to work only at home and doing the work relating to home are considered to be only work that women can do or should work,they are considered only housewives . In these scenario when women work  outside their home the have to  face the criticism as well as the harassment . Moreover their work is rank lower than men counterparts and not preferred  which also result in the low wages.
This is considered the gender discrimination which create difference between men and women in the work