How did japan achieve major increases in its gross domestic product after wwii?

Japan was able to achieve major increases in its gross domestic products through:

- The US supplying aid to them after the war, in an effort to rebuild their cities
- The US using Japan as a stop-over for their troops when fighting the Korean War, which meant that more US money was pouring inside as the US soldiers buy Japanese products and services as they waited there to either go to and from Korea

hope this helps