Final answer:
A one-to-many relationship set from sales reps to customers exists when each sales rep represents multiple customers, but each customer only has one representative. The discussion on tying sales, which occurs when a customer must buy an unwanted product in order to purchase a desired one, is not directly related to this relationship but is another business concept that impacts consumer choices.
Step-by-step explanation:
If each sales rep is related to the many customers he or she represents, and each customer is related to the one sales rep who represents him or her, then there is a one-to-many relationship set from sales reps to customers. This type of relationship is common in business where a single point of contact manages multiple client accounts. However, the question seems to be mixing this concept with that of tying sales, which is a different aspect of business practices.
Tying sales occur when a customer is required to buy one product only if the customer also buys a second product. These sales practices are considered controversial because they can force consumers to purchase additional products that they may not want or need, and which may not provide any advantage to them.
For example, forcing a customer who wants to buy a popular DVD to also purchase a certain model of a portable TV creates an unnecessary and often undesired linkage between products. Conversely, a related practice called bundling is where multiple products or services are offered together at a discounted price, which can be more appealing to customers since it often offers a perceived value or convenience.