Yep...the obvious answer is that women have less money than men, in any society you care to name. They earn less and they own less.
Money is a measure of value. In the U.S., for example, a woman does not get paid for doing "women's work"...taking care of kids, cleaning, cooking, laundry, bookkeeping, any number of computer tasks, etc.
Before you go "ha ha, that's not work," I can say it is work. It is an economic good...you'd have to pay anyone else to do it. It's full time work. A man would never dream of working all day and not getting paid. But a woman works full time, sometimes the equivalent of two full time jobs, for room and board.
I've given it a lot of thought because I "used to work"...the kind of work with a paycheck. Then I had my kids and found out just how much work that is. And people started to say I "wasn't working." And I came to realize how women remain the lesser-paid of the two genders...it's all through not paying them for the work that they do.
A man at his job...no one would tell him to work all day for the love of humanity. He considers his time much more valuable than that. I don't know how to put it...I'm a programmer, I got the same degree that men get here. I competed with men in school and I tutored them too. Now it's like, what I'm doing now is much more important than any paid job. And because it's "women's work," there is no pay and no recognition.
What can I say, it's a mistake to suffer in silence? Nothing ever changes if you do it that way.