Final answer:
Poor service can result in a high percentage of customers not returning to a store.
Step-by-step explanation:
When service is poor, the percentage of customers who refuse to go back to a store can vary depending on the situation. However, it is generally understood that poor service can have a significant impact on customer loyalty. According to a study conducted by McKinsey, even a small decrease in customer satisfaction can lead to a substantial decline in repeat business. In fact, the study found that when service is poor, up to 91% of customers may not return to a store.