Final answer:
Approximately 70% of retail customers avoid returning to a store due to bad customer service, highlighting the significance of quality customer service in retaining customers.
Step-by-step explanation:
When customer service is bad, 70% of retail customers refuse to go back to that store. While actual figures can vary based on different studies and regions, customer service quality is a critical determinant of customer loyalty and repeat business. This emphasizes the importance of providing excellent customer service to maintain a loyal customer base and avoid high turnover rates.