Building on a theory of human intelligence, this book explores the importance of - and limits of - cost/benefit calculus (safety first in hostile environment), on the evolution of economic activity and political discourse. Arguing that intelligence consists of wisdom, cost/benefit reasoning, and creative genius, the book explores the history of the world from hunting and gathering to modern times, drawing on art, literature and invention. It emphasizes ethics, expectations and the importance of historical experience in shaping the humanist economics story.