 The fairness objection also assumes that the advantages of genetic enhancement are competitive advantages, so that an enhancement would make the recipient better able to compete with others for goods such as careers and social status. This assumption underlies concerns both that the availability of enhancements would exacerbate existing inequalities and that if universally available they would be collectively self-defeating (as, for example, if everyone were to add 6 inches to their height) (Glannon 2001). However, this assumption might be false; for example, literacy is a non-genetic enhancement which is beneficial both to the literate person and others (Buchanan 2008).