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This is more than just conjecture. The fact that women undervalue themselves (and by extension, the work they do) has been amply demonstrated in carefully designed experimental economics studies. The two most frequently studied economics games are the dictator and ultimatum games. In the dictator game, one individual is given full authority to keep or share a sum of money with another player. On average, women keep less for themselves than men do. In the ultimatum game, one person is allowed to make an offer as to how the money should be divided, and the other party is given the opportunity to accept or reject the offer. If the offer is rejected, no one gets any money. Both men and women make lower offers to women than to men. Other studies have found that women negotiated harder when they were working on behalf of others rather than for themselves, which implies a reluctance to push their own interests.