Participating students were randomly assigned to one of three conditions single product endorsement, multiple product endorsement, and multiple celebrity endorsement.This study was designed to measure the effects of respective types of celebrity endorsement.This initial attempt to compare the effects of celebrity endorsement could be conducive in understanding current phenomenon of celebrity endorsement campaigns.This study found that multiple product endorsements increased higher level of attitude toward ad, attitude toward brand, and purchase intention than a single celebrity product endorsement while a single celebrity product endorsement increased higher level of attitude toward ad, attitude toward brand, and purchase intention than multiple celebrity endorsements.However, the finding of this study had a conflicting result.
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Nam‐Hyun Um (2008) studied this question.