Which of these promotional elements has the highest cost-per-contact?

Name: Which of these promotional elements has the highest cost-per-contact?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Personal selling involves direct interaction between the salesperson and the customer, which is usually more expensive than other promotional elements such as advertising or publicity. The cost of traveling, lodging, and providing the necessary materials and incentives for the potential customer can add up quickly, resulting in a higher cost-per-contact.

Which of These Promotional Elements Has the Highest Cost-Per-Contact