@unpublished{publication-5753,
	author={Fehr, Ernst and Fischbacher, Urs},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 84},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Why Social Preferences Matter - The Impact of Non-Selfish Motives on Competition, Cooperation and Incentives},
	year=2002,
}