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I think that the problem (if it is still a problem) tends to be artificially exacerbated by the kind of statistics used to explore it. If you take the average of the collective wages/salaries of all working women and compare it with that of men, of course you will get the idea that there is some kind of gender-based inequity. However, the working population of women is much more likely to include (a) women whose career earnings are reduced by time spent on childrearing and part-time work following childrearing; (b) men working during the years between 60 and 65 at an age when women have retired. Given these factors, it appears that there is a gender differential, but that isn't the true picture.
Indeed, amongst younger people, the likelihood is that the gender disparity is the other way and that on average, young women earn more than young men. Why? Because since the mid 1990's more women than men have been attending university and attaining a degree level qualification. As a result they are earning more than their less qualified male counterparts. I look forward to feminists campaigning on behalf of downtrodden males when in 20 or so years time men's wages/salaries are on average lower than womens.
I'll be glad when me partner earns more than me - right now she keeps takin money off me to balance the difference and when I object she punches me in the face!!