Galactic Trade Commission is a technology that can be researched at the Spaceport in Tech Level 4. It costs 300 Food and 200 Nova, and reduces resource trading fee from 30% to 15%. This means that the player earns more when selling resources at the Spaceport, and pay less when buying. Galactic Banking must be researched before it becomes available.
This is an important technology if the player buys and sells a lot of resources at the Spaceport.
"Spaceports are used to buy and sell resources, and with this Tech Level 4 technology, the trading fee for exchanging resources is substantially reduced."