Which groups benefited from World War 1 and which groups did not?

During World War 1, groups that benefited included industrialists and arms manufacturers who saw increased production and profits, as well as women who gained more job opportunities due to the wartime labor shortage. On the other hand, groups that did not benefit included soldiers who faced the horrors of trench warfare and suffered physical and psychological trauma, as well as civilians who experienced food shortages and economic hardships due to the war's impact on the economy.