Inland Sales and Social Levels of Colonists:
Cities in the cities are customers too !
Depending on their social level they are asking for different goods.
(Excamples: Statesmen have high social level, Cigarmakers have middle social level, Farmers or Lumberjacks have low social level.)
Within the buildings Market and Trading Center Shopkeepers sell goods to the citizens of the cities.
Within the building Tavern Tavernkeepers sell alcohol (Beer, Rum, Wine) to the citizens.
This will bring money build also increases satisfaction in the cities.
The Inland Sales are rather small and depend on the number of citizens in that city!
(You will still need to sell most of your goods in Europe.)
Not all goods can be sold in your own colonies !
(Mostly only certain produced goods. With some exceptions like Salt or Luxury Goods from Europe.)
Rich people also demand for Luxury goods from Europe, which you cannot produce yourself.
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There is a little more to it, but that should give you a first idea.
(A lot of that is
not completely implemented by now but I have spent a huge amount of time on that.

)
Especially
KJ_Jansson and
melcher kürzer gave me a lot of help concerning graphics !
Some buildings are taken from other mods. Especially from
Kailrics work I reused a lot.
Feedback ?