.One and very impoortant was mechanization of agriculture in 40s - it freeded up a lot of workforce to fight in WWII. And it increased agriculturar output at same time, and maked food cheaper.
So effect shoudl be 20% output, 10% production cost and say 30% workforce needed (if it is calculated in).
second was revolution is steelmaking industry in 60-70s which increased output while at sime reducing needed warforce by practicaly 50%.
and add yours
