In July 1914, Charles Gide, holder of the chair of Social economy at the Faculty of Law of Paris, was 67 years old. A pacifist, he denounced the rise towards war and criticized the rallying of intellectuals to nationalist hysteria. Although one of his sons will be killed quickly in battle and the second seriously wounded, he will not depart from this critical and anti-conformist attitude, which is even reflected in the many economic articles he devotes to the problems of war economy and preparing for the post-war period. Many similarities can be noted between his proposals on the latter subject and those which will be set out in The Economic Consequences of Peace (1919) by J.M. Keynes, which he also widely shares the denunciation of the Treaty of Versailles.