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Veterinarians generally derive some of their income from selling several manufacturers' lines of pet-care products. Knowing that pet owners rarely throwaway mail from their pets veterinarian unread, one manufacturer of pet-care products offered free promotional materials on its products to veterinarians for mailing to their clients. Very few veterinarians accepted the offer, however, even though the manufacturer's products are of high quality.
Which of the following, if true, most helps to explain the veterinarians' reaction to the manufacturer's promotional scheme?
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