 By claiming that women are oppressed as women, Haslanger reiterates an earlier claim made by radical feminists such as Catharine MacKinnon (see, for example, MacKinnon 1987, 56–57). Indeed, Haslanger’s analysis is heavily indebted to MacKinnon’s work (see Haslanger 2012, 35–82), though she does not endorse MacKinnon’s strong claims about the link between objectivity and masculinity, nor does she adopt a dyadic (or, to use Haslanger’s terminology, reductively agent focused) understanding of oppression. But, like MacKinnon, Haslanger believes that “gender categories are defined relationally – one is a woman (or a man) by virtue of one’s position in a system of social relations” (58). This means that “one’s gender is an extrinsic property, and…it is not necessary that we each have the gender we now have, or that we have any gender at all” (58). Since the social relations in terms of which gender categories are defined are relations of hierarchical domination and structural oppression, “gender is, by definition, hierarchical: Those who function socially as men have power over those who function socially as women” (61). As Haslanger admits, referencing the sex/gender distinction, this does not mean that all males have power over all females – but it does mean that females who are not subordinated by males are not, strictly speaking, women, and vice versa. Moreover, as Haslanger notes, “MacKinnon’s account of gender, like others that define gender hierarchically, has the consequence that feminism aims to undermine the very distinction it depends upon. If feminism is successful, there will no longer be a gender distinction as such” because the complex of social relations of domination and structural oppression that give gender its meaning will no longer exist (62). While endorsing MacKinnon’s radical conclusion with respect to the currently existing gender categories of ‘man’ and ‘woman’, Haslanger’s own account offers a somewhat more nuanced view that allows for the future possibility of a kind of gender difference that would not be predicted on gender dominance: “gender can be fruitfully understood as a higher order genus that includes not only the hierarchical social positions of man and woman, but potentially other non-hierarchical social positions defined in part by reference to reproductive function. I believe gender as we know it takes hierarchical forms as men and women; but the theoretical move of treating men and women as only two kinds of gender provides resources for thinking about other (actual) genders, and the political possibility of constructing non-hierarchical genders” (235)