Equal pay
I'm very pro that, but then my company sells pay auditing software. It's not simple though: EU law is that work has to be of "equal value". How do you determine what that is?
Job evaluation is a good place to start, but not all JE systems are equal. For instance the Hay system is a well established and widely accepted JE system, but it could be said to be gender biased: "The Hay system consistently values male-dominated management functions over non-management functions more likely to be performed by women."
(Steinburg, R. J. (1992).