"How Supply and Demand Lists Are Determined" is very detailed, but shows that 'designing' a cities default commodities is a painstaking business that may compromise your terrain choices. CivCity can change the starting ones (though I don't know what causes the bugs), but they will change at intervals in the scenario.
Another useful thread from these master reverse engineers is "Calculating Caravan and Freight Delivery Payments"
Another useful thread from these master reverse engineers is "Calculating Caravan and Freight Delivery Payments"
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