Originally published in 1918, this book presents the content of the W. Stanley Jevons lectures for that year, which were delivered by William Robert Scott at University College, London. Written in the context of the First World War, the text presents an analysis of the relationship between economics and post-war peace, attempting to formulate the general economic conditions involved in the cessation of warfare. This book will be of value to anyone with an interest in the relationship between economics, infrastructure and war.