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The use ofcelebrity endorsers is a popular executional device, but it is not without risk. The authors report three studies examining how negative information about a celebrity can affect the brand the celebrity endorses. Using an associative network model of memory as a theoretical framework, they considered four moderating variables: the size of the association set for the brand, the size of the association set for the celebrity, the timing of the negative celebrity information, and the strength of the associative link between the brand and the celebrity. In the first two studies, they used a fictitious but realistic celebrity endorser and in the third they used an actual celebrity. Negative information about a celebrity resulted in a decline in attitude toward the endorsed brand only for the fictitious celebrity. That general relationship was moderated in varying degrees by association set size, timing of the negative information, and the strength of the link between brand and celebrity.

Co‐branding is an increasingly popular technique marketers use in attempting to transfer the positive associations of the partner (constituent) brands to a newly formed co‐brand (composite brand). This research examines the effects of co‐branding on the brand equity of both the co‐branded product and the constituent brands that comprise it, both before and after product trial. It appears that co‐branding is a win/win strategy for both co‐branding partners regardless of whether the original brands are perceived by consumers as having high or low brand equity. Although low equity brands may benefit most from co‐branding, high equity brands are not denigrated even when paired with a low equity partner. Further, positive product trial seems to enhance consumers’ evaluations of co‐branded products, particularly those with a low equity constituent brand. Co‐branding strategies may be effective in exploiting a product performance advantage or in introducing a new product with an unfamiliar brand name.

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