2. Why a salesperson researches, learns and follows up

Explain why it is important for a salesperson to (a) research the market to be sure the product or service meets the needs of customers; (b) learn all about the product to be sold; (c) if possible, visit where the product is built and learn how it is constructed, or, for a service, learn its benefits to the customer; (d) follow up with customers after their purchase to confirm their satisfaction and discuss their concerns.