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Trust and Social Collateral

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Author Info

  • Dean Karlan

    (Yale University.)

  • Markus Mobius

    (Harvard University and NBER.)

  • Tanya Rosenblat

    (Iowa State University.)

  • Adam Szeidl

    (University of California-Berkeley.)

Abstract

This paper builds a theory of trust based on informal contract enforcement in social networks. In our model, network connections between individuals can be used as social collateral to secure informal borrowing. We define network-based trust as the largest amount one agent can borrow from another agent and derive a reduced-form expression for this quantity, which we then use in three applications. (1) We predict that dense networks generate bonding social capital that allows transacting valuable assets, whereas loose networks create bridging social capital that improves access to cheap favors such as information. (2) For job recommendation networks, we show that strong ties between employers and trusted recommenders reduce asymmetric information about the quality of job candidates. (3) Using data from Peru, we show empirically that network-based trust predicts informal borrowing, and we structurally estimate and test our model. (c) 2009 by the President and Fellows of Harvard College and the Massachusetts Institute of Technology..

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File URL: http://www.mitpressjournals.org/doi/pdfplus/10.1162/qjec.2009.124.3.1307
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Bibliographic Info

Article provided by MIT Press in its journal Quarterly Journal of Economics.

Volume (Year): 124 (2009)
Issue (Month): 3 (August)
Pages: 1307-1361

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Handle: RePEc:tpr:qjecon:v:124:y:2009:i:3:p:1307-1361

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Web page: http://mitpress.mit.edu/journals/

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Web: http://mitpress.mit.edu/journal-home.tcl?issn=00335533

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