This volume collects together the papers and reviews in which Hayek fought his battle against socialism through the 1930s and 40s, a battle which culminated in his most famous work The Road to Serfdom . The material is divided into three sections: Hayek’s contributions to the famous market socialism debate; Hayek’s responses to the onset of war, including his response to Keynes’ How to Pay for the War ; and his papers on the relationship between economic planning and freedom. The volume draws on Hayek’s shorter articles for weeklies, and his reviews, as well as his academic papers and articles. It also includes an introduction, providing background information and outlining the significance of the period for Hayek’s intellectual development.