There’s that concept again, “impede progress toward a world of fairness and equality.”
The Constitution guarantees neither fairness nor equality. You are born equal, but everything changes after that; and that’s a good thing. And, fairness is a communist concept. It does not correspond to life; it corresponds to some perverted view of wants and desires.
If you are paid less than someone else, it’s because you are perceived by your employer as not putting out as much effort as your coworker. If you want more pay then work harder or get a different job.
It's bad, isn't it? Of course I was being sarcastic. Not too many of us here believe that fairness and equality are sane motivations for any sort of effective public policy ... I think.