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The effects of prior knowledge about a product class on various characteristics of pre-purchase information search within that product class are examined. A new search task methodology is used that imposes only a limited amount of structure on the search task: subjects are not cued with a list of attributes, and the problem is not structured in a brand-by-attribute matrix. The results indicate that prior knowledge facilitates the acquisition of new information and increases search efficiency. The results also support the conceptual distinction between objective and subjective knowledge.
Merrie Brucks (1985) studied this question.