they help groups overcome the collective action problem

Gerald Marwell has written:

'The critical mass in collective action' -- subject(s): Collective behavior, Microsociology, Social action

An action group is a group of people joined to accomplish a task or participate in collective action.

Collective good problem is the problem of "how to provide something that benefits all members regardless of what each member contributes to it". The three principles used to solve collective goods problem are Dominance, reciprocity, and Identity.(By Alpha Otieno)

unsatisfied workers