Final answer:
The self-service model emphasizes customer independence in selecting products, while the relationship-building model focuses on personalized service and nurturing long-term customer relationships.
Step-by-step explanation:
The difference between the self-service model and the relationship-building model of selling products and services lies predominantly in the level of interaction and personalized service provided to the customer. In the self-service model, customers typically access goods or services without the direct help of sales staff. This model relies on the customer's ability to select products independently, which is common in retail environments such as supermarkets or online stores.
On the other hand, the relationship-building model is characterized by salespersons actively working to create a personal connection with the customer. Here, the focus is on understanding the customer's needs and preferences, providing customized solutions, and nurturing long-term relationships that encourage repeat business and customer loyalty. This model is often employed in B2B (business-to-business) settings or in high-end consumer markets.