Which product category was one of the first to successfully use sales promotion in the early nineteenth century?

Name: Which product category was one of the first to successfully use sales promotion in the early nineteenth century?
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Question

Quizplus · Accepted Answer

Cereal was one of the first product categories to successfully use sales promotion in the early nineteenth century. Companies such as Kellogg's and Post offered free samples, contests, and coupons to entice customers to try their products.

Which Product Category Was One of the First to Successfully