Following Adam Smith, conventional economics gives self-interest the primary role of all economic behavior. However, past experiments with the ultimatum game often produce outcomes inconsistent with this orthodox conception of 'economic man.' In our replication of the ultimatum experiment, students at a small, liberal arts college do not allocate monetary rewards in a self-interested manner, but rather their choices conform with the social norm of 'fairness' (i.e., a 50/50 split). Contrary to past research, we find that economic majors are less motivated by self-interest than other students.