 Those in the negative camp try to cut off this line of reasoning at the first step, by denying that there is any necessary relation between one’s freedom and one’s desires. Since one is free to the extent that one is externally unprevented from doing things, they say, one can be free to do what one does not desire to do. If being free meant being unprevented from realizing one’s desires, then one could, again paradoxically, reduce one’s unfreedom by coming to desire fewer of the things one is unfree to do. One could become free simply by contenting oneself with one’s situation. A perfectly contented slave is perfectly free to realize all of her desires. Nevertheless, we tend to think of slavery as the opposite of freedom. More generally, freedom is not to be confused with happiness, for in logical terms there is nothing to stop a free person from being unhappy or an unfree person from being happy. The happy person might feel free, but whether they are free is another matter (Day, 1970). Negative theorists of freedom therefore tend to say not that having freedom means being unprevented from doing as one desires, but that it means being unprevented from doing whatever one might desire to do (Steiner 1994. Cf. Van Parijs 1995; Sugden 2006).