 Thus, those whom Berlin places in the negative camp typically conceive of the agent as having the same extension as that which it is generally given in ordinary discourse: they tend to think of the agent as an individual human being and as including all of the empirical beliefs and desires of that individual. Those in the so-called positive camp, on the other hand, often depart from the ordinary notion, in one sense imagining the agent as more extensive than in the ordinary notion, and in another sense imagining it as less extensive: they think of the agent as having a greater extension than in ordinary discourse in cases where they identify the agent’s true desires and aims with those of some collectivity of which she is a member; and they think of the agent as having a lesser extension than in ordinary discourse in cases where they identify the true agent with only a subset of her empirical beliefs and desires — i.e., with those that are rational, authentic or virtuous. Secondly, those in Berlin’s positive camp tend to take a wider view of what counts as a constraint on freedom than those in his negative camp: the set of relevant obstacles is more extensive for the former than for the latter, since negative theorists tend to count only external obstacles as constraints on freedom, whereas positive theorists also allow that one may be constrained by internal factors, such as irrational desires, fears or ignorance. And thirdly, those in Berlin’s positive camp tend to take a narrower view of what counts as a purpose one can be free to fulfill. The set of relevant purposes is less extensive for them than for the negative theorists, for we have seen that they tend to restrict the relevant set of actions or states to those that are rational, authentic or virtuous, whereas those in the negative camp tend to extend this variable so as to cover any action or state the agent might desire.