"Political Economy" by W. Stanley Jevons is a seminal work in the field of economics, first published in the late 19th century. In this influential text, Jevons explores the principles of economic theory, emphasizing the importance of utility and the role of individual decision-making in economic behavior. Jevons introduces the concept of marginal utility, which revolutionized economic thought by illustrating how consumers make choices based on the additional satisfaction gained from consuming one more unit of a good. He critiques classical economics and argues for a more scientific approach to understanding economic phenomena. The book covers various topics, including value, production, consumption, and the distribution of wealth. Jevons also discusses the significance of mathematics in economic analysis, advocating for a rigorous, quantitative approach to economic theory. Overall, "Political Economy" remains a cornerstone in the study of economics, influencing subsequent thinkers and contributing to the development of modern economic theory.