Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/282441 
Year of Publication: 
2023
Series/Report no.: 
CESifo Working Paper No. 10753
Publisher: 
Center for Economic Studies and ifo Institute (CESifo), Munich
Abstract: 
We study how social interaction and friendship shape students' political opinions in a natural experiment at Sciences Po, the cradle of top French politicians. Quasi-random assignments of students into the same short-term integration groups before their scholar curriculum reduce political opinion gap, and increase friendship formation. Using the pairwise indicator of same-group membership as instrumental variable for friendship, we find that friendship causes a reduction of differences in opinions by 40% 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.
Subjects: 
political opinion
social networks
friendship effect
polarization
homophily
extremism
natural experiment
JEL: 
C93
D72
Z13
Document Type: 
Working Paper
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