Social sanctions in response to injunctive norm violations.

Injunctive social norms are societal standards for how people are expected to behave. When individuals transgress these norms, they face social sanctions for their behavior. These sanctions can take many forms ranging from verbal or non-verbal reactions and from disapproval to ostracism. We review the stable characteristics and situational variables that affect a bystander's tendency to enact social sanctions against someone who violates an injunctive social norm. Stable characteristics include the bystander's extraversion, altruism, the belief that others can change their behavior, and their cultural background. Situational factors include the extent to which the violated norm implicates the bystander, the social hierarchies among the bystander and transgressor, the presence of additional bystanders, and (when applicable) the bystander's relationship to the victim of the norm violation. We also discuss the costs that a bystander can incur by attempting to enact social sanctions. We conclude with a discussion of the application of social sanctions to enforce pro-social social norms.