This study examines the application of Islamic business ethics in building customer loyalty at Depo Bangunan Mapan Jaya Ponorogo. The implementation of Islamic values in business practices is essential, not only as moral guidance but also as a strategic factor in fostering customer trust and long-term loyalty. Islamic business ethics emphasize principles such as honesty, justice, responsibility, trustworthiness, and the prohibition of fraud, which are expected to influence customer satisfaction and loyalty. The purpose of this study is to analyze the application of Islamic business ethics, identify supporting factors, and examine their impact on customer loyalty at Depo Bangunan Mapan Jaya Ponorogo. This research employs a qualitative descriptive approach with a field research design. Data were collected from primary and secondary sources. Primary data were obtained through direct observation and in-depth interviews with the business owner and employees, while secondary data were derived from documentation related to business operations. The research was conducted at Depo Bangunan Mapan Jaya Ponorogo. Data collection techniques included observation, interviews, and documentation, and data analysis was carried out through data reduction, data presentation, and conclusion drawing. The findings indicate that Depo Bangunan Mapan Jaya Ponorogo consistently applies Islamic business ethics in its daily operations. Employees and management provide honest and fair services, avoid price manipulation, and transparently explain product quality to customers. Friendly, polite, and responsible service attitudes also strengthen customer relationships. The application of Islamic business ethics positively impacts customer loyalty, as reflected in repeat purchases and sustained trust. In conclusion, Islamic business ethics play a significant role in fostering sustainable customer loyalty and creating a trustworthy, ethically sound business environment.
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