The book investigates the fundamental principles and practical applications of economic development and planning. Jan Tinbergen, a Nobel laureate in Economics, draws upon his extensive experience to present a comprehensive framework for understanding and guiding economic growth. The work likely explores various models, policy instruments, and the challenges inherent in formulating and implementing effective development strategies in diverse national contexts.

As a foundational text by a pioneering economist, 'Economic Development and Planning' is likely regarded as a significant contribution to the field. Its focus on practical planning suggests it would be of interest to policymakers, academics, and students of development economics. The work probably offers a rigorous, analytical perspective on the complexities of fostering economic progress.