With whom do we associate the "value-added theory" of crowd behaviour?

Question

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The "value-added theory" of crowd behaviour is most closely associated with Neil Smelser, a sociologist who developed the theory in the 1960s. The theory posits that certain conditions or "stages" must be present for a crowd to form and for collective behavior to occur, including structural conduciveness, structural strain, similarity of beliefs and values, and the presence of precipitating factors.

With Whom Do We Associate the "Value-Added Theory" of Crowd