Final answer:
The practice of influencing a guest's purchase decision through the use of sales phrases is known as suggestive selling. Tying sales require customers to buy a second unwanted product in order to purchase the first, while bundling offers multiple products or services together at a discount, often more appealing to consumers.
Step-by-step explanation:
The practice of influencing a guest's purchase decision through the use of sales phrases is known as suggestive selling. This method involves recommending additional products or services that complement the primary purchase. An example of this would be a salesperson at a tech store who, when selling a smartphone, suggests that the customer also buy the best data plan available. This can lead the customer to make additional purchases like an extended warranty, which is a larger request.
Tying sales is a different concept where customers must purchase a second product to have the option of buying the first. This practice is controversial as it may force consumers to buy something they do not actually want or need. An example of this would be a store requiring the purchase of a specific model of a portable TV when buying a popular DVD, which restricts consumer choice.
Lastly, bundling is a related concept where two or more products are sold together at a discounted rate, which can be more appealing for the customer and an effective sales strategy, as seen with cable companies offering combined services like cable, internet, and a phone line.