Collective action problem

A situation in which individuals have incentives to avoid contributing to a shared group effort, even when cooperation would benefit the group.

Free-rider problem: A failure of contribution that occurs when people can benefit from a shared good without paying its costs. It captures the central incentive to let others bear the cost of collective effort.
Public good: A good that is non-excludable and non-rivalrous, so people cannot easily be barred from it and one person's use does not diminish another's. Many collective action problems arise around benefits that contributors cannot reserve for themselves.
Climate change mitigation: Actions that reduce or prevent greenhouse-gas emissions and strengthen carbon sinks. Each state bears mitigation costs while many benefits are shared globally.
Tragedy of the commons: The depletion of a shared, rival resource when individuals have incentives to use it for personal gain. It centers on overuse of a common resource, while collective action problems also include failures to provide shared benefits.
Ostrom’s design principles: Principles Elinor Ostrom identified for governing common-pool resources, including clear boundaries, monitoring, and graduated sanctions. They show how local institutions can sustain cooperation without relying solely on privatization or central control.
Public goods game: An experiment in which participants choose how much to contribute to a shared pool that benefits the group. It models how private contribution choices generate group-level outcomes.
Collective action: Coordinated effort by multiple people to pursue an outcome they share. The problem concerns the conditions under which this effort is difficult to sustain.
Labor union: An organization through which workers bargain collectively over pay, conditions, and workplace rights. Workers can benefit from union gains without accepting the costs or risks of organizing.
Coordination game: A game in which players benefit from choosing compatible actions, often with multiple possible equilibria. Coordination can fail through mismatched choices rather than incentives to avoid contributing.
Mechanism design: The study of designing rules and institutions to achieve desired outcomes when participants have private information and incentives. It asks how rules can align individual choices with collective goals.

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