Final answer:
Providing nutritional information is not a common marketing tactic to encourage purchases of manufactured foods; it is a legal requirement for product transparency, in contrast to other strategies like promotions, samples, and celebrity endorsements.
Step-by-step explanation:
The marketing tactic that is NOT commonly used to encourage consumers to purchase manufactured foods is providing nutritional information. While nutritional information is required on food packaging by law, it doesn't necessarily serve as a tactic to motivate purchases. Instead, it's intended to inform the consumer about what they're eating. On the other hand, offering discounts or promotions, providing free samples, and using celebrity endorsements are proactive strategies deployed by companies to increase the appeal of their products and stimulate sales.Providing nutritional information is not a common marketing tactic to encourage purchases of manufactured foods; it is a legal requirement for product transparency, in contrast to other strategies like promotions, samples, and celebrity endorsements.