Cooperation is not rewarded by friendship, but generous and selfish students repel each other in social networks

• Flóra Samu,

  Roles Formal analysis, Investigation, Methodology, Validation, Visualization, Writing – original draft, Writing – review & editing

  Affiliation CSS-RECENS, HUN-REN Centre for Social Sciences, Budapest, Hungary

  ⨯
• Simone Piras,

  Roles Conceptualization, Data curation, Methodology, Software, Supervision, Writing – review & editing

  Affiliation Social, Economic and Geographical Sciences, The James Hutton Institute, Aberdeen, Scotland, United Kingdom

  https://orcid.org/0000-0003-0334-6800

  ⨯
• Simone Righi,

  Roles Conceptualization, Data curation, Investigation, Methodology, Software, Supervision, Writing – review & editing

  Affiliation Department of Economics ‘Marco Biagi’, University of Modena and Reggio Emilia, Modena, Italy

  https://orcid.org/0000-0001-9821-8451

  ⨯
• Marco Setti,

  Roles Conceptualization, Funding acquisition, Resources

  Affiliation Department of Agricultural and Food Sciences, University of Bologna, Bologna, Italy

  ⨯
• Károly Takács

  Roles Conceptualization, Supervision, Writing – review & editing

  * E-mail: karoly.takacs@liu.se

  Affiliations Institute for Analytical Sociology, Department of Management and Engineering, Linköping University, Norrköping, Sweden, CSS-RECENS, HUN-REN Centre for Social Sciences, Budapest, Hungary

  https://orcid.org/0000-0001-9126-3233

  ⨯