That is a complete myth! It's calculated solely by total income earned. It does not take into account different jobs, hours worked, etc.
Men tend to pursue more remunerative jobs than women, including dangerous/undesirable ones.
Often men put in longer hours as well. If a true apples to apples comparison were done, women probably out earn men.
There was a female speaker that did some kind of talk in 2007, and even by then, 17 years ago, female millennials were making more money than their male peers for the same jobs.
I'm not sure why Freepers are spreading this myth.
Do you think it is a myth that women tolerate lower pay than men?
If women DO tolerate less pay than men for the same work, then that certainly would contribute to a wage gap.
What factors do you believe offset this particular contribution to differential pay for men and women, such that there is no overall wage gap?