The Gender Pay Gap that...

wasn't? ....

 Look at this Freakonomics piece

http://freakonomics.com/podcast/the-true-story-of-the-gender-pay-gap-a-new-freakonomics-radio-podcast/

I used to think Freaknomics was a good program. Now I don't think so, anymore.
I disagree with this podcast very much, but it's worth reading.

It's hard to get the numbers that show how much choosing 'temporal flexibility' is not a choice, really.

For a very different take, check 

The American Association of University Women (AAUW)'s presentation:

The Simple Truth about the Gender Pay Gap

 A "nice" quote from the AAUW presentation:

"While the pay gap has steadily narrowed over time, it is nowhere near being eliminated, and in recent years progress has actually stalled. In the 10 years between 2004 and 2014, the earnings ratio has barely budged, changing from 78 percent in 2013 to 79 percent in 2014—a change that is not significantly different."

More about whether it's a myth or not here
No, The Gender Pay Gap Isn't A Myth -- And Here's Why | Huffington Post .

So according to the number of occurrences in Google search page, the gender gap is a myth. I don't buy it. Do you?