We got another developer diary from the new Paradox game Millennia!
This time the diary is again about how the economy works. Overall this works comparable to Civ, in the sense that you have a city where you build buildings which give bonuses in certain areas, and in the surrounding you build improvements. The improvements produce distinct goods though (so wheat is not exchangable with pigs or rice), and this has overall downstream effects. For more information the economy in Millennia please check this thread.