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People participate in protests even though it is costly, benefits are not exclusive to participants, and each individual is unlikely to
be pivotal. Building on these characteristics, I propose a sequential model of protest formation where opportunities to participate
arrive stochastically, and the protest succeeds if participation surpasses a threshold. I show that a unique equilibrium exists and
characterize its dynamics. If the unique equilibrium involves participation, the time between participation decisions shortens as the
protest progresses|a pattern observed empirically. A player with an opportunity becomes sequentially pivotal if, after abstaining, the
protest will likely end before another opportunity arrives.
