At the conclusion of World War I, the Allied and Associate Powers included in the Treaty of Versailles a plan for reparations to be paid by Germany; 20 billion gold marks was to be paid while the final figure was decided. In 1921, the London Schedule of Payments established the German reparation figure at 132 billion gold marks (separated into various classes, of which only 50 billion gold marks was required to be paid). German industrialists in the Ruhr Valley, who had lost factories in Lorraine which went back to France after the war, demanded hundreds of millions of marks compensation from the German government.