Trade takes place transparently over trade routes between planets. Effectively each planet will have a supply and demand system that sets its requirements for resources, growth rate and production. Each planet will generate an amount of resources that it can sell and will require a certain amount of resources to support its population. Each planet will also effectively produce money that is considered ‘services’ this way a planet will not become useless by its own regard. Trade routes are used and the average time required for transit is factored into the system. Blockades will restrict trade.
Rebellion2:Trade
From SWR Wiki
