Women are less aggressive in establishing pay as said in the article and are also more likely to leave the workforce. Pay isn't just about paying you for your work. Pay from your employer is also partially an incentive from your employer to stay with them and not go somewhere else. You are an investment by your employer. It costs tens of thousands of dollars to hire and train workers in corporate fields. They don't want you to leave. Women are more likely to jump ship for non-work related reasons - whether that be for family (marriage, maternity), career changes (women change career paths more often than men), and medical (women take more sick days, work less hours, and are more frequently file for disability). Fact of the matter is men are more driven, focused workers in most professional fields. I'm not saying men are always the "better" worker, but in most instances because of social pressures and natural tendencies, men are the more aggressive, career-minded, focused, and driven individuals who work longer hours and take less time off from the job.