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Testing Unilateral and Bilateral Link Formation

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  • Comola, Margherita
  • Fafchamps, Marcel

Abstract

The literature has shown that network architecture depends crucially on whether links are formed unilaterally or bilaterally, that is, on whether the consent of both nodes is required for a link to be formed. We propose a test of whether network data is best seen as an actual link or willingness to link and, in the latter case, whether this link is generated by an unilateral or bilateral link formation process. We illustrate this test using survey answers to a risk-sharing question in Tanzania. We find that the bilateral link formation model fits the data better than the unilateral model, but the data are best interpreted as willingness to link rather than an actual link. We then expand the model to include self-censoring and find that models with self-censoring fit the data best.

Suggested Citation

  • Comola, Margherita & Fafchamps, Marcel, 2009. "Testing Unilateral and Bilateral Link Formation," CEPR Discussion Papers 7406, C.E.P.R. Discussion Papers.
  • Handle: RePEc:cpr:ceprdp:7406
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    References listed on IDEAS

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    13. Arcand, Jean-Louis & Fafchamps, Marcel, 2012. "Matching in community-based organizations," Journal of Development Economics, Elsevier, vol. 98(2), pages 203-219.
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    Citations

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    Cited by:

    1. Margherita Comola & Marcel Fafchamps, 2010. "Are gifts and loans between households voluntary?," CSAE Working Paper Series 2010-20, Centre for the Study of African Economies, University of Oxford.
    2. Dzemski, Andreas, 2017. "An empirical model of dyadic link formation in a network with unobserved heterogeneity," Working Papers in Economics 698, University of Gothenburg, Department of Economics, revised Apr 2018.
    3. Marcel Fafchamps & Julien Labonne, 2017. "Do Politicians’ Relatives Get Better Jobs? Evidence from Municipal Elections," Journal of Law, Economics, and Organization, Oxford University Press, vol. 33(2), pages 268-300.
    4. Comola, Margherita & Fafchamps, Marcel, 2014. "Estimating Mis-reporting in Dyadic Data: Are Transfers Mutually Beneficial?," IZA Discussion Papers 8664, Institute for the Study of Labor (IZA).
    5. Joost Vandenbossche & Thomas Demuynck, 2013. "Network Formation with Heterogeneous Agents and Absolute Friction," Computational Economics, Springer;Society for Computational Economics, vol. 42(1), pages 23-45, June.
    6. d'Exelle, Ben & Riedl, Arno, 2016. "Gender differences and social ties effects in resource sharing," Research Memorandum 023, Maastricht University, Graduate School of Business and Economics (GSBE).
    7. Margherita Comola & Marcel Fafchamps, 2017. "The Missing Transfers: Estimating Misreporting in Dyadic Data," Economic Development and Cultural Change, University of Chicago Press, vol. 65(3), pages 549-582.
    8. Margherita Comola & Mariapia Mendola, 2013. "The Formation of Migrant Networks," Development Working Papers 353, Centro Studi Luca d'Agliano, University of Milano.
    9. Norma Olaizola & Federico Valenciano, 2016. "From bilateral two-way to unilateral one-way flow link-formation," SERIEs: Journal of the Spanish Economic Association, Springer;Spanish Economic Association, vol. 7(2), pages 257-278, June.
    10. Margherita Comola & Marcel Fafchamps, 2010. "Are gifts and loans between households voluntary?," Working Papers halshs-00564894, HAL.
    11. repec:eee:jeborg:v:139:y:2017:i:c:p:1-25 is not listed on IDEAS
    12. Margherita Comola, 2010. "The network structure of mutual support links: Evidence from rural Tanzania," Working Papers halshs-00585968, HAL.
    13. Rapallini, Chiara & Rustichini, Aldo, 2016. "Elective affinities matter as much as ethnicity in multi-ethnic schools," Journal of Economic Behavior & Organization, Elsevier, vol. 131(PA), pages 243-262.
    14. Comola, Margherita & Prina, Silvia, 2014. "Do Interventions Change the Network? A Panel Peer-Effect Model Accounting for Endogenous Network Changes," IZA Discussion Papers 8641, Institute for the Study of Labor (IZA).
    15. Pablo Branas-Garza & Natalia Jimenez & Giovanni Ponti, 2017. "Eliciting real-life social networks: a guided tour," Journal of Behavioral Economics for Policy, Society for the Advancement of Behavioral Economics (SABE), vol. 1(1), pages 33-39, February.
    16. Yann Bramoullé & Bernard Fortin, 2009. "The Econometrics of Social Networks," Cahiers de recherche 0913, CIRPEE.
    17. Landmann, Andreas & Vollan, Björn & Frölich, Markus, 2011. "Saving, Microinsurance: Why You Should Do Both or Nothing. A Behavioral Experiment on the Philippines," Proceedings of the German Development Economics Conference, Berlin 2011 51, Verein für Socialpolitik, Research Committee Development Economics.

    More about this item

    Keywords

    network architecture; pairwise stability; risk sharing;

    JEL classification:

    • C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Hypothesis Testing: General
    • C52 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Evaluation, Validation, and Selection
    • D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation

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