I feel, delivering essential goods should be required to push Factions into positive states *
Want you faction to grow, feed them, supply them with clothes and domestic appliances
Just as when there are famines and outbreaks, one, in theory, delivers food cartridges and basics medicines to end the state.
Weapons during war time etc etc
Also if certain goods are now being traded, that should trigger the wanted missions.
If everyone is just trading Beryllium, but they also need say Copper to produce what ever the station produces, Power Gennys? , then missions for Copper wanted, should be generated.
You would not need to trade the exact numbers, but just have the missions look at what is in high demand but low or nil player deliveries and create missions for that good.
It is just about it feeling like a living economy, even if we have the NCP super freighters in the background assumed to be supply the billions of people with food and raw materials etc etc.
* Dislciamer I assume they are not but might be wrong