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The effects of social norms on motivation crowding: experimental evidence from the Tibetan PlateauA growing literature examines conditions under which financial incentives for behavior change can undermine "crowd out" or reinforce ("crowd in") other sources of motivation for the behavior in question. Some of this literature points to a potential role of social norms, but it has not attempted to quantify that role. We present an interdisciplinary model from economics and communication science that measures the effects of financial incentives on social norms and their joint effects on behavior, including after incentives have ended. In a framed field experiment with Tibetan herders in Qinghai, China, we find that a temporary payment for participation in a patrol against illegal wildlife trapping reinforces a perceived injunctive norm that this conservation behavior meets with social approval. This norm remains heightened even after the payment has ended, continuing to positively influence the decision to participate in anti-trapping patrols in the experiment. This finding suggests that, under certain circumstances, a carefully framed incentive for conservation behavior can support injunctive norms in favor of conservation behavior.