What were two ways that countries used economic policies to control the cost of world war i?

The front lines had to be channeled with male workers, and one of the economic policies used to control the cost of war was forcing women and children to work at the production of weapons and munition. ...

Food became an issue during WWI, with severe food shortages reported in urban areas by 1915.

that would be the steamboat because none of the other things are forms of transportation