gross national product
The burden of the war upon participating countries has been measured through the percentage of gross national product (GNP) devoted to military expenditures. Nearly one-quarter of Germany's GNP was committed to the war effort in 1939, and this rose to three-quarters of GNP in 1944, prior to the collapse of the economy. In 1939, Japan committed 22 percent of its GNP to its war effort in China; this rose to three-quarters of GNP in 1944. Italy did not mobilize its economy; its GNP committed to the war effort remained at prewar levels.
