The availability heuristic says that we assume that the more available some piece of information is to memory, the more frequently we must have encountered it in the past. This heuristic is partly true. In general, the frequency of experience does affect its availability to memory. But frequency of experience is not the only thing that affects availability to memory. Salience or vividness matters as well.
( Barry Schwartz )
[ The Paradox of Choice: Why ]
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