If you're interested in this sort of subject, Thomas McCraw's book Creating Modern Capitalism: How Entrepreneurs, Companies, and Countries Triumphed in Three Industrial Revolutions gives excellent overviews of how the economies of Japan and Germany operated before, during, and after the war.

One interesting and counter-intuitive fact I learned is that both countries came out of the war with a significantly greater industrial capacity than they had beforehand. Despite the enormous devastation, the wartime build-up was even more immense, and left both countries poised for recovery.