I think you are mistaken. The old Mother Courage motto, "War is good for business", holds true as ever. The Nazi economy was essentially like a fire. Of course, it eventually consumed everything, which came its way. The trick was to throw a bit of oil on the fire and then stand back and run off with your loot before you lost everything. That is what the businessmen did very successfully. IG Farben (now Bayer) did not go broke in the war!