I'm not entirely sure on which angle you're trying to discuss here. That biological preferences don't impact on the free market choice of employee-employer cont

I'm not entirely sure on which angle you're trying to discuss here. That biological preferences don't impact on the free market choice of employee-employer contracts? Or that biological preferences aren't overridden by a desire to earn higher wages? For free market choice on which jobs pay more -- I think this one is pretty clear. Do you think differently? As for biological preference, I don't think it takes into account the average pay at all. Career path is usually chosen at a younger and more idealistic age, and probably more importantly - poorer countries have women overriding their preferences and going into higher paid lines of work, while richer countries let women do what they want. As per this very study. In the case where money doesn't matter because your family is rich, biological preferences become more important and people stop choosing based on average pay. So the biological differences seem to explain it really well.