@unpublished{publication-5744, author={Hens, Thorsten and Schenk-Hoppé, Klaus Reiner and Vogt, Bodo}, institution={University of Zurich}, issn={1424-0459}, number={No. 108}, series={Working paper series / Institute for Empirical Research in Economics}, title={On the Micro-foundations of Money: The Capitol Hill Baby-Sitting Co-op}, year=2002, }