Keynes also attended the Conference on the Versailles Treaty to end World War I. He wrote "The Economic Consequences of the Peace" in 1919, and "A Revision of the Treaty" in 1922. In his books he said that the reparations which Germany was being made to pay would ruin the German economy and would lead to further fighting in Europe. These predictions were shown to be true when the German economy suffered in the hyperinflation of 1923. Reparations were only completed in 2010.