“…To contribute to a public good is a special case of a “prosocial” social norm. Social norms have been shown to play a role for littering (Cialdini, Reno, & Kallgren, ; Torgler, Frey, & Wilson, ), energy consumption (Allcott, ), recycling (Hage, ; Viscusi, Huber, & Bell, ), smoking (Nyborg & Rege, ), fuel economy (Yeomans & Herberich, ), or tax evasion (Frey & Torgler, ; Luttmer & Singhal, ). Farrow, Grolleau, and Ibanez () provide an overview of the theoretical approaches and empirical evidence related to proenvironmental behaviors.…”