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Related to availability cascade: Availability bias, Availability heuristic
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23) More simply, an availability cascade results from the "interaction of the 'availability heuristic'--a mental shortcut by which an individual judges the probability of an event by his or her ability to conjure up examples of that event--and the social mechanisms through which risk perceptions are propagated.
Availability cascades The idea of following the crowd in order to maintain one's social reputation and acceptability is a major element of Timur Kuran and Cass Sunstein's theory of availability cascades.