The Japanese were dependent on their merchant fleet… which
- Kept on losing trading partners, as the number and power of her enemies multiplied;
- Had to redirect her transports to assist the war effort, stressing her supply lines and hitting her pocketbook;
- (Japanese) Imperialism means that her traders will tend to stay within her own empire, and not connect with other nations and cultures, thus restricting growth & interdependence. “The Inward Turn”, indeed.
The video is short, but punchy, and gives food for thought to those Referees considering how a local, regional or Imperium-wide interstellar war would impact local economies.