When people base their estimates of the likelihood of an event on how often they've heard of such an event, they illustrate the

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The availability heuristic is a mental shortcut that relies on immediate examples that come to a person's mind when evaluating a specific topic, concept, method, or decision. When people estimate the likelihood of events based on how easily examples come to mind, they are using the availability heuristic. This can be influenced by how often they've heard about such events, making those events seem more common than they actually are.

When People Base Their Estimates of the Likelihood of an Event