If a previously unpaid activity (donating blood) is paid then we often observe that this activity is reduced. In this paper, it is hypothesised that the price offered is taken as a proxy for the "market value" of the activity. Depending on how the actor valued the activity previously,...

Motivationen treiben Entscheidungen an. Doch welche Ziele werden im Kontext ökonomischer Entscheidungen verfolgt? Sowohl die 'Realität' als auch die experimentelle Wirtschaftsforschung zeichnen ein widersprüchliches Bild. 'Fairneß' beeinflußt Verhandlungsergebnisse, 'Reziprozität' hilft...

In the Solidarity Game (Selten and Ockenfels, 1998), two "rich" persons can support a "poor" one. A strong positive correlation between one rich person's solidarity contribution and his expected contribution of the other is observed. This paper investigates the causality behind this correlation....

Models to the issue of altruism which rely on externalities of well-being are rarely used explicitly. In this paper we compare such utility-based approaches with the standard approach on altruism which is based on externalities of income. Testable differences of both types of models are derived...