I recently came across a study by Benjamin Artz, Amanda Goodall, and Andrew J. Oswald that concluded that women actually are asking for raises as often as men, but their requests are treated differently. This led me to another interesting study by Andreas Leibbrandt and John A. List that found that men and women had similar negotiation behaviors when job descriptions specifically noted that the wages were negotiable. If it was not mentioned, then the men in the study were more likely to negotiate than the women.