No. Women should be payed less if their medical condition causes them to do less work. The problem is that such may not be true.
Even and aside from this not being a medical condition the overwhelming majority of the time, which I suggest we avoid....
I have never understood why Americans love to penalize people for being sick:Forget the medical bankruptcies and all that, which is huge in and of itself, we just hate sick people.
I broke my foot in college, badly. I couldn't really walk for about 2 years and the best I could manage was a limp. People were total assholes about it and didn't care at all that
I broke 3 bones in my foot due to the fact that I jogged 4 miles a day and there was a pothole covered by leaves! The leaves kept me from seeing the pothole, which shouldn't have been there in the first place (if people weren't cheap bastards who let roads rot....), and I broke my foot when I set it down there in stride....
It was hell getting ACCOUNTING jobs, that don't require you to do much of anything physical.... We just have this crazy perception that because someone is sick they are somehow worth less as a human being and that their productivity is less somehow. People also looked at me like I was utterly insane.... WTF? No one cut me any damn slack in any way and I had to threaten to take action against my professors for bitching at me for being late to class. Figure this out, I can't walk quickly while limping and your class is on the other side of campus, I do damn good work and never miss a day, but always come in late on account of that *sigh*
There's this bullshit delusion we are totally in control of everything: Until and unless you are God, fuck off, you're wrong. We love to think, "O well, if they were more careful, then they wouldn't have gotten injured/sick...." This is why they call it an accident..... Statistically (*gasp* there I go asking people to think again, anything but that....) we know for a certainty that if you have enough people, some percentage of them will get hurt/sick. It's the laws of probability, not everyone being stupid who happens to get sick/hurt. It's also why we have institutions like hospitals set up with full time doctors.... It's entirely foreseeable that this will occur to someone, and it is impossible to tell who it will occur to in advance....
Yet, we love to persist in this myth because it allows us to do our three favorite things:
1.) Blame someone else
2.) Implicitly compliment ourselves (cause I"m not sick I must but special/smart Herp Derp)
3.) Avoid thinking.
Recovery:Even from a purely economic standpoint, we should want sick people to recover and provide better work at better health, which was the original reason employers gave into the demand to provide health insurance, that and keeping everyone in the office from catching what one person had. Helping sick people get better is better for everyone, same thing with injured people. But we just love to think short term "What have you done for me lately?" Not what have you done in the past, not what will you do in the future, how are you making me money, right this second....
Then when stuff (the economy, society, companies etc) falls apart, because nobody even tried to plan for the future, we wonder why. It's a mystery and no one is responsible....