“…As the group rewards or punishes positive as well as negative deviations, individuals adjust their behavior. In addition, social approval based on norm compliant behavior seems to be positively correlated with the share of the population that acts according to these norms (e.g., Rege, 2004), while behaviors based on different social norms may crowd out each other (e.g., Greenberg, 2014 The contributions to a public good may also depend substantially on their visibility (e.g., Bé-nabou and Tirole, 2006;Ariely et al, 2009). The concept of signaling was primarily applied in contract theory (e.g., Spence, 1973), but is also transferable to the impacts of image and acting as an example in consumption behavior (e.g., Frank, 1985;Ariely et al, 2009).…”