The interactive role of source expertise, time of source identification, and involvement was examined in an experiment on advertising effectiveness. In general, findings support an elaborative processing explanation. A three-way interaction among the manipulated variables emerged in the study, which utilized print advertisement stimuli. The findings also suggest that the source expertise information was processed more as a central persuasion cue than as peripheral information. Managerial implications are offered.
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Homer et al. (1990) studied this question.
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