The article "Casting for Big Ideas: A New Manifesto for Agency Managers" discusses the need for a smarter agency architecture in the advertising industry. It covers topics such as agency structure, pitching strategies, the role of creative and media departments, the impact of the internet, and the importance of strategic planning. The authors also provide management lessons on growing agencies, ownership principles, network integration, and insights into the future of advertising. The article emphasizes the value of big ideas in advertising and the need for agencies to adapt to changing trends in the industry.