@unpublished{publication-5509,
	author={Fehr, Ernst and Naef, Michael and Schmidt, Klaus M},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 300},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={The Role of Equality and Efficiency in Social Preferences},
	year=2006,
}