Final answer:
Tying sales happen when a customer is required to buy one product only if they also buy a second product to increase their total spending. This tactic can be seen at McDonald's by asking if the customer wants fries with their meal. It can also be seen in merchandising by putting complementary items together in a display.
Step-by-step explanation:
Tying sales happen when a customer is required to buy one product only if the customer also buys a second product. This sales tactic aims to increase the customer's total spending. For example, at McDonald's, when they ask, "Do you want fries with that?", they are trying to add to the sale to make the customer spend more money. This can also be done in merchandising by putting complementary items together in display, like displaying chips next to salsa.