Final answer:
A store owner can use the foot-in-the-door technique to sell an expensive product by getting the customer to agree to a smaller request before presenting the larger request.
Step-by-step explanation:
A store owner can use the foot-in-the-door technique to sell an expensive product by first getting the customer to agree to a smaller request before presenting the larger request. For example, if a customer is buying a smartphone, the salesperson may suggest purchasing a data plan. Once the customer agrees to that, the salesperson can then suggest the purchase of a three-year extended warranty. By agreeing to the smaller request, the customer is more likely to also agree to the larger request. This technique relies on the principle of consistency, where people have a natural tendency to behave in line with their previous commitments.