Institute for Empirical Research in Economics University of Zurich Working Paper Series ISSN 1424-0459 forthcoming in: Economic Journal 2002 Working Paper No. 84 Why Social Preferences Matter – The Impact of Non-Selfish Motives on Competition, Cooperation and Incentives Ernst Fehr and Urs Fischbacher January 2002 Why Social Preferences Matter - The Impact of Non-Selfish Motives on Competition, Cooperation and Incentives Ernst Fehra) University of Zurich, CESifo and CEPR Urs Fischbacherb) University of Zürich Frank Hahn Lecture Annual Conference of the Royal Economic Society 2001 Forthcoming in: Economic Journal 2002 Abstract: A substantial number of people exhibit social preferences, which means they are not solely motivated by material self-interest but also care positively or negatively for the material payoffs of relevant reference agents. We show empirically that economists fail to understand fundamental economic questions when they disregard social preferences, in particular, that without taking social preferences into account, it is not possible to understand adequately (i) the effects of competition on market outcomes, (ii) laws governing cooperation and collective action, (iii) effects and the determinants of material incentives, (iv) which contracts and property rights arrangements are optimal, and (v) important forces shaping social norms and market failures. a) Ernst Fehr, Institute for Empirical Research in Economics, University of Zurich, Bluemlisalpstrasse 10, CH-8006 Zurich, Switzerland, email:
[email protected]. b) Urs Fischbacher, Institute for Empirical Research in Economics, University of Zurich, Bluemlisalpstrasse 10, CH-8006 Zurich, Switzerland, email:
[email protected]. Contents 1 Introduction 1 2 The Nature of Social Preferences 2 2.1 Positive and Negative Reciprocity: Two Examples …...............