- In order to do this; we first need to see what some of the broad issues with the X4 economy are:-
- Demand is a pyramid that culminates at shipbuilding; which means that the only thins that matter are the stations and sectors related to shipbuilding, while the rest may as well be fried chicken
- Supply is broadly distributed and has no appreciable variance across sectors; everything is available everywhere, and there's little reason to move away from the shipyard sectors to get better materials
[*}Civilian economy and demands are nonexistent; everyone eats universal rations, seems to need little water and generally works like they live in an idealized version of the Soviet Union
[*}Complete absence of taxes and tolls
Demand needs to be diversified and increased at all levels. From intermediate demand for food and water to demands for various goods from different sources, such as demands for Hull Parts and Rations from ships, or demands for non ration based foodstuffs from populations.
This would allow for a greater overall demand and greater opportunity for the player to find markets, especially for goods that don't get used as much in the present shipbuilding based demand economy. This would in turn also help with the demand for stuff like gases and Ice, which otherwise don't have much of a market.
Supply
Supply is too generalized; there is little appreciable differences that can push you towards one sector or the other in order to secure resources.
Perhaps the most promising resource here is Energy Cells, whose supply can be heavily localized by linking production to the star strength (and by varying star strength) within the (sub)sector. Combining that with more demand could easily turn them into an Oil analogue, giving intrinsic value to sectors with high star strength.
Supply can also extend to expensive civilian wares which may be sold in limited quantities by trading stations and be unique to each sector depending on the planet.
Civilian Economy
This can be a massive part of the economy; from shuttles transporting passengers to demand for more and varied goods to satisfy the needs to civilian populations.
One simple thing that can be added with relative ease is varied food demand; making food demand greater, adding and increasing demand for water and switching rations from the primary food source to one that's used as a backup for emergencies.
This can also be used to generate missions such as transporting civilian populations out of stations under attack and supplying food to famine hit stations.
Taxes
These could serve as an additional incentive to make stations in distant sectors and taking control of sectors.