2 Theories of Collective Action

What collective action involves

Collective action occurs when people coordinate to pursue a shared purpose. It ranges from spontaneous crowd behavior to sustained social movements that seek changes in policy, institutions, or culture.

Different theories emphasize different parts of this process: how people influence one another, why they feel aggrieved, how they organize, and how political and cultural settings shape their efforts. No single cause explains all collective action.

How crowds develop shared conduct

Contagion theory explains crowd behavior as spreading through imitation and emotional influence. Early accounts suggested that crowds could overwhelm individuals’ usual judgment and lead to rapid, coordinated action. This perspective draws attention to the spread of behavior and emotion, but older versions often portrayed crowds as irrational and underplayed participants’ purposes and social relationships.

Emergent norm theory offers a more interactional account. In an uncertain or unfamiliar situation, people observe one another, propose ways to interpret events, and develop temporary norms that guide action. A crowd is therefore not necessarily normless: participants may create shared expectations as events unfold.

For example, people responding to a disaster may consider taking essential supplies acceptable when ordinary rules and services no longer meet urgent needs. Emergent norms help explain how collective conduct becomes organized, but do not by themselves explain why some interpretations gain wider acceptance or how movements sustain action over time.

How perceived injustice motivates action

Relative deprivation describes the perception that one’s group—or oneself—is unfairly worse off than a relevant comparison group or than what is believed to be deserved. The comparison and the accompanying sense of injustice matter: hardship alone does not automatically produce protest.

Perceived group disadvantage can motivate people to challenge unequal treatment, especially when they believe action may improve the situation. This approach helps explain grievances and motivation, but grievances are widespread while collective action is not.

The relationship between deprivation and action varies with how deprivation is measured and whether the analysis matches individual or group-level experience. Deprivation can help explain why people may want change, but it usually needs to be considered alongside organization, opportunity, and interpretation.

How movements build capacity

Resource mobilization theory shifts attention from grievance alone to the practical capacity to act. Movements need resources such as money, time, skills, leadership, communication channels, organizational networks, and allies. Organizations can gather these resources, coordinate participants, sustain campaigns, and negotiate with authorities.

Resources may come from members as well as supporters outside the aggrieved group. For example, people who object to a local policy may share a grievance, but a campaign becomes more feasible when they have a meeting place, organizers, a communications network, and access to sympathetic institutions.

This perspective treats movements as strategic and socially organized rather than as automatic expressions of discontent. Its limitation is that resources alone do not explain why a cause resonates, why people accept risks, or why some moments are more favorable than others.

How politics shapes mobilization

Political process theory explains mobilization through the interaction of movement organization and its political environment. It highlights political opportunities, such as divisions among elites, influential allies, changes in government policy, or shifts in the openness and repressive capacity of the state. Opportunities do not guarantee success; movements must recognize and act on them.

Mobilizing structures—including formal organizations and informal networks—help movements organize participants. Movement claims also need to be communicated and made meaningful. Collective-action frames define a problem, identify causes or responsibility, propose a remedy, and give people reasons to participate.

For example, a protest campaign may grow when a policy dispute is framed as a common injustice, local networks can mobilize participants, and a political opening makes decision-makers more responsive. Political process approaches thus connect organization and opportunity with shared interpretation.

Identity, culture, and social change

New social movement approaches draw attention to movements concerned not only with economic distribution or access to the state, but also with identity, culture, autonomy, rights, and control over everyday life. Movements around gender, the environment, peace, and cultural recognition illustrate this broader range of claims.

Scholars such as Alberto Melucci emphasize how collective identity and shared meanings are created and sustained through interaction. These approaches broaden analysis of power: movements may seek changes in institutions and public policy, as well as changes in social norms, identities, and accepted ways of understanding an issue.

This perspective does not mean contemporary movements have left class or material inequality behind. Economic interests, cultural claims, organizational resources, and political opportunities can overlap. Critics also caution that a narrow focus on state-centered politics may miss movements working across multiple institutions and arenas of social life.

How the explanations fit together

The theories answer complementary questions. Contagion and emergent norms illuminate interaction in crowds; relative deprivation explains perceived injustice; resource mobilization explains organizational capacity; political process theory connects mobilization to political openings and framing; and new social movement approaches highlight identity, culture, and claims that extend beyond conventional politics.

A fuller account of institutional change considers how grievances become shared interpretations, how networks and organizations turn those interpretations into sustained action, and how action encounters institutions able to resist, accommodate, or transform demands. Collective action can challenge and reshape institutions through the interaction of motivation, shared norms and identities, organization, resources, framing, and political conditions.