Final answer:
Customer rapport is a close, harmonious relationship founded on mutual trust in selling.
Step-by-step explanation:
A close, harmonious relationship founded on mutual trust in selling is known as Customer rapport.
Customer rapport refers to the connection and understanding established between a salesperson and a customer through effective communication and positive interactions. It involves building trust, understanding the customer's needs and preferences, and maintaining a good relationship over time.
This term is commonly used in the field of sales and marketing to emphasize the importance of building strong relationships with customers, as it can lead to repeat business, referrals, and long-term success.