Are political activists driven by instrumental motives such as making a career in politics or mobilizing voters? We implement two natural field experiments in which party activists are randomly informed that canvassing is i) effective at mobilizing voters, or ii) effective for enhancing...

How does a citizen's decision to participate in political activism depend on the participation of others? We conduct a nation-wide natural field experiment in collaboration with a major European party during a recent national election. In a party survey, we randomly provide canvassers with true...

Many social movements face fierce resistance in the form of a countermovement. When deciding to become politically active, a movement supporter, therefore, has to consider both her own movement's activity, but also that of the opponent. This paper studies the decision of a movement supporter to...