There are many studies that have been done that state an observation that I made when I first got into HR. Women are less likely to ask for a raise or a promotion.
NPR did a great piece on All Things Considered last year addressing this topic. Check it out.
There are many reasons why, despite widespread gains in the workplace, women still earn on average about 78 cents to a man’s dollar. But the failure to negotiate higher pay is crucial. Research shows men are four times more likely than women to ask for a salary raise, and economist Linda Babcock of Carnegie Mellon University says this has a snowball effect. Even a small pay boost will mean bigger annual raises and possibly bigger bonuses and it will carry over to a new employer, who is almost certain to ask: What was your last salary?
Ladies, you probably deserve a raise. You know if you deserve a promotion. Quit with the coy and hopeful approach. Go in and ask for it. The worst that can happen is you hear no.