Most of these studies still fail to apply for a number of different decisions. Degree, seniority, distance from home to work, amount of profit made for the company, hours worked, overtime, amount of days off taken, etc.
The results differ from study to study. Some that consider ALL the different factors suggest you can explain the entire wage gap. The ones that don't, find a difference with a maximum of 5%.
Pay differences due to gender are illegal virtually everywhere. If this was really the case, why isn't anyone starting a class action lawsuit? Because if you can prove this really happens, they would win the lawsuit instantly.
It also doesn't explain why it is that women under 30 in big cities out-earn their male peers.http://content.time.com/time/business/article/0,8599,2015274,00.html