Industrial capacity and population. In 1938 Germany had the third highest GDP/capita in the world at $5,983/person, and 68 million citizens. Italy had a population of 43 million and a GDP/capita of $3, 244. Germany was the second largest manufacturer in the world, Italy was 8th, by a wide margin. Over the course of the war, Germany produced 89,000 military aircraft and 46, 000 tanks. Italy produced 13,000 military aircraft and 3000 tanks.

Source: Azar Gat. War In Human Civilization.