Economy types question

[kiario]

Hi, thanks for taking the time and answering,

Is this correct?

Refinery need things from Extraction
Agricultural need things from High Tech
Industrial need things from Refinery

Is there more to it?

 

[OfftheRails]

There's more to it, but that's a pretty good start. Population, minor faction influence, prosperity, landing pads, security ratings and allegiance are all involved to varying degrees. This is a pretty good reference for supply and demand:

Trader's Bible