The report examines the cost-efficiency of European retail banks, comparing their performance and identifying factors that contribute to success. The study aims to provide a reference for industry practitioners, analysts, policymakers, and scholars, as well as inspiration for banks seeking to increase efficiency. The report highlights the importance of embracing revenue-creating costs while avoiding those that do not add value for customers. Strong cash flow allows banks to invest in new markets, products, or technologies, reward shareholders, and offer better services or lower prices to customers. The study reveals many ways to increase cost-efficiency, including a flat hierarchy, clever use of technology, and a cost-conscious culture. The report concludes that cost-efficiency is crucial for a bank's freedom to maneuver and achieve success in the industry.