This book shows that the existing theories on economic growth have clear limitations in terms of how much they can effectively contribute to actual economic growth. Therefore, this book presents a more effective theory on economic growth for countries and leaders looking to promote economic growth. It is essentially centered around the theory of economic growth and theory of national development, written for agricultural developing countries pursuing industrialization and late-starting industrialized countries pursuing their own development. Nevertheless, it also makes a significant contribution to the very development of human civilization through the growth of developing countries, late-starting industrialized countries and early industrialized countries throughout the world.