Some known theories about collective action are value-added theory, contagion theory, convergence theory, emergent norm theory. When working conditions improve after workers' attempts is an example of value-added theory. When a sports team wins a championship, a peaceful street celebration results with vandalism. It is an example of contagion theory. When people protest against hate crime is an example of convergence theory. When a schoolteacher loses control of a class because of one student is a typical example of emergent norm theory.
