Persistent Political Engagement: Social Interactions and the Dynamics of Protest Movements Leonardo Bursztyn Davide Cantoni David Y. Yang Noam Yuchtman Y. Jane Zhang* June 2019 Abstract We test whether participation in one protest within a political movement increases subsequent protest attendance, and why. To identify an effect of protest participation, we randomly, in- directly incentivize Hong Kong university students into participation in an antiauthoritarian protest. To identify the effects of social interactions, we randomize the intensity of this treat- ment across major-cohort cells. We find that experimentally-induced protest participation is significantly associated with protest attendance one year later, though political beliefs and preferences are unaffected. Persistent political engagement is greatest among individuals in the cells with highest treatment intensity, suggesting that social interactions sustained persis- tent political engagement. Keywords: Political movements, social interactions JEL Classification: D74, P0 *Bursztyn: University of Chicago and NBER. Email:
[email protected]. Cantoni: Ludwig-Maximilians- Universitat¨ Munich, CEPR, and CESifo. Email:
[email protected]. Yang: Harvard University and J-PAL. Email:
[email protected]. Yuchtman: LSE, NBER, and CESifo. Email:
[email protected]. Zhang: Hong Kong University of Science and Technology. Email:
[email protected]. Helpful and much appreciated suggestions, critiques and encouragement were provided by Dan Berkowitz, Andrei Shleifer, seminar participants at Cambridge, Harvard, Heidelberg, Imperial, INSEAD, Northeastern, NUS, Oxford, Pompeu Fabra, Sussex, Yale, Zurich, and conference par- ticipants in Munich and Atlanta (ASSA). Raymond Han, Moritz Leitner, Glen Ng, Aakaash Rao, and Meggy Wan provided excellent research assistance. Cantoni acknowledges financial support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement n.