Critics of the act have suggested that by mandating various forms of leave that are used more often by female than male employees, the Act, like the Pregnancy Discrimination Act of 1978, makes women more expensive to employ than men. They argue that employers will engage in subtle discrimination against women in the hiring process, discrimination which is much less obvious to detect than pregnancy discrimination against the already hired. Throughout history, gender discrimination towards women was common; certain laws were placed that would restrict a woman's option in choosing a working position, as well as, how many hours she could work ei. Employers Supporters counter that the act, in contrast to the Pregnancy Discrimination Act of 1978, is aimed at both women and men, and is part of an overall strategy to encourage both men and women to take family-related leave. However, this is based on the assumption that men will take advantage of the opportunity of unpaid leave at comparable rates to women. According to Grossman, there is no basis for this assumption upon the inception of the legislation and no evidence has been found today to support this assumption. Therefore, the employer incentive to prefer male employees is preserved despite the equal opportunity for both sexes to take leave.