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When making political and economic decisions (e.g., voting, donating money to a cause), individuals consider the expectations of groups with which they identify. These expectations are injunctive norms, shared beliefs about appropriate behavior for identity group members, and individuals' choices reflect trade-offs between adherence to these norms and other preferences. We show that when those who identify moderately/strongly with the group pay a cost as a consequence of avoiding a norm violation, they subsequently view the norms as stronger than those that paid no cost. This is evident in their greater willingness to pay an additional cost to punish/reward other group members for violating/complying with the norm. They also view other norms associated with the identity as stronger. In this way, costly norm compliance may be self-reinforcing.