Sergio Currarini () (Department of Economics, University Of Venice Cà Foscari and School for Advanced Studies in Venice) Paolo Pin (Abdus Salam International Center for Theoretical Physics, Trieste and University of Venice) Matthew O. Jackson (Department of Economics, Stanford University and the Santa Fe Institute.)
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We develop a model of friendship formation that sheds light on segregation patterns observed in social and economic networks. Individuals come in different types and have type-dependent benefits from friendships; we examine the properties of a steady-state equilibrium of a matching process of friendship formation. We use the model to understand three empirical patterns of friendship formation: (i) larger groups tend to form more same-type ties and fewer other-type ties than small groups, (ii) larger groups form more ties per capita, and (iii) all groups are biased towards same-type relative to demographics, with the most extreme bias coming from middle-sized groups. We trace each of these empirical observations to specific properties of the theoretical model and highlight the role of choice and chance in generating homophilous behavior. Finally we discuss welfare implications of the model.
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Paper provided by University of Venice "Ca' Foscari", Department of Economics in its series Working Papers with number
2007_20.
References listed on IDEAS Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
Acemoglu, Daron & Shimer, Robert, 1999.
"Holdups and Efficiency with Search Frictions,"
International Economic Review,
Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 40(4), pages 827-49, November.
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