@unpublished{publication-5698, author={Falk, Armin and Fischbacher, Urs and G{\"a}chter, Simon}, institution={University of Zurich}, issn={1424-0459}, number={No. 150}, series={Working paper series / Institute for Empirical Research in Economics}, title={Living in Two Neighborhoods - Social Interactions in the Lab}, year=2003, }