What is the sales promotion technique that rewards consumers with an item either for free or at reduced cost when they purchase another product called?

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This sales promotion technique is called a premium offer, where a consumer is rewarded with an item for free or at reduced cost when they purchase another product. Sampling involves providing a small portion of a product to consumers to try before purchasing. A prize is given through contests or sweepstakes. Specialty advertising involves promotional items like keychains or pens with a company's name or logo.

What Is the Sales Promotion Technique That Rewards Consumers with an Item