This comprehensive analysis delves into the critical concepts and strategies of sales development and merchandising, exploring their impact on maximizing sales and profits. The paper examines the role of product mix, market segmentation, buyer behavior, personal selling techniques, operational design, and various promotional activities. It also evaluates the effectiveness of internal and external merchandising materials, highlighting the influence of design and layout on customer spending. The analysis is grounded in real-world examples, particularly focusing on the case of Hilton Hotels in London, providing practical insights into the application of these concepts in the hospitality industry.