So far as I know it is dependent on how often the good can be find on the worldmap, and that is dependent on the probability entry in the goods.txt, and it is dependent on the distance of the two cities between the good is traded, therefore you get on an ultra gigantic map a lot of more gold of trade than on a small map but you need also more caravans. However in GoodMod you have also an terrain bonus of the goods.
-Martin
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Civ2 military advisor: "No complaints, Sir!"
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