There's a vast difference between suboptimal decision making and ignoring a massive cost saving. The line that "went make X% as much as men" is widely spread, it's inconceivable that executives
haven't heard this line. And the profi gains from a 10-20% reduction in labor costs would be staggering. No, prejudice doesn't cut it as a rationale.
Slavery existed because preindustrial societies were heavily labor intensive and the returns on more skilled labor was marginal. The industrial revolution changed this, which is why abolition movements largely coincided with industrialization.
Restrictions of women's liberties stem from thousands of years of family dynamics where child mortality rates meant that women had to spend most of their fertile years bearing and caring for children. The replacement rate in preindustrial societies was something like 5-6 births per woman due to such high infant mortality rates.
> The differences in hours doesn't account for the difference in pay
It actually does, men work 2 more normal hours and 1 more overtime hour on average. Assuming overtime is paid at 2x normal wages this is about a 10% disparity in paid hours. And again, there's more than just hours worked there's travel nursing, different metro areas, and more.
> Show me a single study that reinforces the data that backs up your position that satisfies the level of granularity you're grasping at.
You're asking me to prove a negative. I don't doubt you can find individual instances of discrimination against women (and against men), my point is that the large disparities between men's and women's average wages overwhelmingly stem from differences in men and women's behavior rather than discrimination.