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There is a noticeable parallel between the ways that commercial fishermen and department stores generate a competitive fury among those they wish to hook. To attract and arouse the catch, fishermen scatter some loose bait called chum. For similar purposes, department stores holding a bargain sale toss out a few especially good deals on prominently advertised items called loss leaders. If the bait—of either form—has done its job, a large and eager crowd forms to snap it up. Soon, in the rush to score, the group becomes agitated, nearly blinded, by the adversarial nature of the situation. Human beings and fish alike lose perspective on what they want and begin striking at whatever is being contested.
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Robert B. Cialdini (Influence: The Psychology of Persuasion)