Abstract

Collective action occurs when people voluntarily join with one another for obtaining collective goods, such as rights and equality, that institutions fail to provide or bloc them from getting. Collective action has to overcome obstacles due to free riding, recruitment, participation, costs of organizing, and social control by the opposition. Collective actions range from episodic protests and hostile crowds to sustained social movements and civil strife.Collective action theory in the tradition of methodological individualism assumes that individuals make adaptive decisions under uncertainty, contingent on expectations about the decisions of peers, opponents and bystanders. The four key variables of participation are number of participants, costs of participation, the value of the collective good, and the production function for different tactics and modes of contestation.The reduction of uncertainty is achieved by strategies of resource mobilization, selective incentives, solidarity, bloc mobilization, political opportunity, shared culture, mass media effects, signaling of information, and pace setter-follower diffusion dynamics. The theory explains unconventional political and social advocacy in democratic and autocratic regimes, from routine politics, strikes, demonstrations, hostile crowds to social movements and other modes of confrontation.