 A third worry is that full self-ownership may permit voluntary enslavement. Just as people have, on this view, the right to control uses of their persons, they also have the right to transfer their rights over their persons to others, for example through sale or git. However, this is controversial among libertarians, some of whom deny that these kinds of transfers are possible because it’s morally impossible for others to control one’s will (Rothbard 1982; Barnett 1998, pp. 78–82), because such transfers undermine our autonomy (Grunebaum 1987), or because of theological reasons (Locke 1690). Theorists who endorse the possibility usually argue that libertarian self-ownership is about giving people control over the permissible uses of their person, not about the necessity of some psychological capacity to control their person. As a result, the right to exercise one’s autonomy is what matters here, even if one exercises it in (otherwise) problematic ways, not the protection or promotion of autonomy. (See e.g. Vallentyne 1998; Steiner 1994.)