This volume draws on Hayek's shorter articles for weeklies, and his reviews, as well as academic papers and articles. It also includes a substantial introduction, providing full background and outlining the significance of this period for Hayek's intellectual development. 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's How to Pay for the War; his papers on the relationship between economic planning and freedom.