Economy was a complex yet simple matter. It stands upon the foundation of logistics, manufacturing, and trust. The United World Government had become the economic powerhouse of the sea region of Terra. Not merely because of their unrivalled naval power, but through their fleet of cargo ships.
After the establishment of the UWG, the fleet admiral introduced the Atlas Corporation. A massive private company under the grasped of the United World Government. The reason for the divide of state-owned enterprises was to assure they wouldn't be affected by the prescribed tariffs of their supposed neighbors.
Whether it'd be what remained of the allied islands, or the factions outside of the sea region.
However, most importantly, within the Atlas Corporation was the donated cargo ships of the fleet admiral. The cargo ships were generally classified as container ships, ensuring the deliverance of goods between islands.