Being perceived as trustworthy comes with substantial economic benefits in many situations. Making other people think you are a trustworthy person may, therefore, be an important motive for charity and other forms of prosocial behavior, provided these activities work as signals of...

It has been shown that psychological predispositions to benefit others can motivate human cooperation and the evolution of such social preferences can be explained with kin or multi-level selection models. It has also been shown that cooperation can evolve as a costly signal of an unobservable...

NGOs and other non-profit organizations attract workers who strongly identify themselves with their missions. We study whether these "good guys" are more trustworthy and how such pronounced group identities affect trust and trustworthiness within the groups and toward out-groups. We find that...