Stirner has been broadly understood as a proponent of both psychological egoism and ethical egoism, although the latter position can be disputed as there is no claim in Stirner's writing in which one ought to pursue one's own interest and further claiming any "ought" could be seen as a new "fixed idea". Therefore, he may be understood as a rational egoist in the sense that he considered it irrational not to act in one's self-interest. However, how this self-interest is defined is necessarily subjective, allowing both selfish and altruistic normative claims to be included. Further, rationality as an end in and of itself is another fixed idea.