@unpublished{publication-5792,
	author={Fehr, Ernst and Klein, Alexander and Schmidt, Klaus M},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 72},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Fairness, Incentives and Contractual Incompleteness},
	year=2001,
}