 Note that characterizing norms simply as clusters of expectations might be misleading; similarly, a norm cannot simply be identified with a recurrent behavioral pattern either. If we were to adopt a purely behavioral account of norms there would be no way to distinguish shared rules of fairness from, say, the collective morning habit of tooth brushing. After all, such a practice does not depend on whether one expects others to do the same; however, one would not even try to ask for a salary proportionate to one’s education, if one expected compensation to merely follow a seniority rule. In fact, there are behavioral patterns that can only be explained by the existence of norms, even if the behavior prescribed by the norm in question is currently unobserved. For example, in a study of the Ik people, Turnbull (1972) reported that starved hunters-gatherers tried hard to avoid situations where their compliance with norms of reciprocity was expected. Thus they would go out of their way not to be in the position of gift-taker, and hunted alone so that they would not be forced to share their prey with anyone else. Much of the Ik’s behavior could be explained as a way of eluding existing reciprocity norms.