DP13771 Friendship Networks and Political Opinions: A Natural Experiment among Future French Politicians

Author(s): Yann Algan, Nicolo Dalvit, Quoc-Anh Do, Alexis Le Chapelain, Yves Zenou
Publication Date: June 2019
Date Revised: December 2020
Keyword(s): extremism, friendship effect, homophily, learning, Natural Experiment, Polarization, Political opinion, Social Networks
JEL(s): C93, D72, Z13
Programme Areas: Labour Economics, Public Economics
Link to this Page: cepr.org/active/publications/discussion_papers/dp.php?dpno=13771

We study how social interaction and friendship shape students' political opinions in a natural experiment at Sciences Po, the cradle of top French politicians. We exploit arbitrary assignments of students into short-term integration groups before their scholar cursus, and use the pairwise indicator of same-group membership as instrumental variable for friendship. After six months, friendship causes a reduction of differences in opinions by one third of the standard deviation of opinion gap. The evidence is consistent with a homophily-enforced mechanism, by which friendship causes initially politically-similar students to join political associations together, which reinforces their political similarity, without exercising an effect on initially politically-dissimilar pairs. Friendship affects opinion gaps by reducing divergence, therefore polarization and extremism, without forcing individuals' views to converge. Network characteristics also matter to the friendship effect.