Best known for reviving the tradition of classical liberalism, F. A. Hayek was also a prominent scholar of the philosopher John Stuart Mill. One of his greatest undertakings was a collection of Mill’s extensive correspondence with his longstanding friend and later companion and wife, Harriet Taylor-Mill. Hayek first published the Mill-Taylor correspondence in 1951, and his edition soon became required reading for any study of the nineteenth-century foundations of liberalism. This latest addition to the Collected Works of F. A. Hayek series showcases the fascinating intersections between two of the most prominent thinkers from two successive centuries. Hayek situates Mill within the complex social and intellectual milieu of nineteenth-century Europe—as well as within twentieth-century debates on socialism and planning—and uncovers the influence of Taylor-Mill on Mill’s political economy. The volume features the Mill-Taylor correspondence and brings together for the first time Hayek’s related writings, which were widely credited with beginning a new era of Mill scholarship.