@unpublished{publication-5673,
	author={Benz, Matthias and Frey, Bruno S},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 173},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={The Value of Autonomy: Evidence from the Self-Employed in 23 Countries},
	year=2003,
}