@unpublished{publication-5597,
	author={Ewerhart, Christian and Nitzsche, Christoph},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 229},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={On the Notion of the First Best in Standard Hidden Action Problems},
	year=2005,
}