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...

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...

Reciprocity is a decisive behavioural rule resulting in successful co-operation or deterrence. In this paper, a dynamic model is proposed, where reciprocity is described by changes in altruistic (or malevolent) ties. Multiple steady states may exist in one of which there may be general...