Final answer:
In Stage 1 of Rostow's model of economic development, the most important industrial demand associated with labor is raw materials.
Step-by-step explanation:
In Stage 1 of Rostow's five-stage model of economic development, the most important industrial demand associated with labor is raw materials. This is because in the traditional society stage, the economy is primarily based on agriculture, so the availability and access to raw materials for farming are crucial.