People behave pro-socially in a wide variety of situations that standard economic theory is unable to explain. Social comparison is one explanation for such pro-social behavior: people contributeif others contribute or cooperate as well....

Volunteering constitutes one of the most important pro-social activities. FollowingAristotle, helping others is the way to higher individual well-being. This view contrasts with theselfish utility maximizer who avoids costs from helping others. The two rival views are studiedempirically. We find...

A common feature of the literature on the evolution of preferencesis that evolution favors nonmaterialistic preferences only if preferencetypes are observable at least to some degree. We argue that this resultis due to the assumption that in each state of the evolutionary dynam-ics some Bayesian...

We analyze the effects of introducing asymmetric information and expectations in the investment game (Berg et al., 1995). In our experiment, only the trustee knows the size of the surplus. Subjects' expectations about each other's behavior are also elicited. (...)

The existing literature acknowledges that a mismatch between the experimenter'sand the subjects' models of an experimental task can adversely aect the interpretation ofdata from laboratory experiments. We discuss why the two common experimental designs(between-subjects and within-subjects) used...

We analyze the effects of introducing asymmetric information andexpectations in the investment game (Berg et al., 1995). In our experiment,only the trustee knows the size of the surplus. Subjects’expectations about each other’s behavior are also elicited. Our resultsshow that average payback...

Am Abend des 30. Oktober 1938 löste eine Radiosendung in den USA eine Massenhysterie aus (vgl. Wells 1974: 342). Das Hörspiel Krieg der Welten wurde von ca. sechs Millionen Menschen verfolgt, zwei Millionen von ihnen glaubten, die Sendung basiere auf aktuellen Geschehnissen. Die darauf...

During the last two decades economists have made much progress in understanding incentives, contracts and organisations. Yet, they constrained their attention to a very narrow and empirically questionable view of human motivation. The purpose of this paper is to show that this narrow view of...

There is a longstanding concern that material incentives might undermine prosocial motivation, leading to a decrease in blood donations rather than an increase. This paper provides an empirical test of how material incentives affect blood donations in a large-scale field experiment spanning...