@unpublished{publication-5358,
	author={Wichardt, Philipp C and Schunk, Daniel and Schmitz, Patrick W},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 398},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Participation costs for responders can reduce rejection rates in ultimatum bargaining},
	year=2008,
}