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In trying to brush away the rust, I have been combing civ2 sites for basic info and have come across the nitty-gritties of trade routes which might bear reproducing here (as I have not seen this tabling in the threads I have come across here). Source is the Scrolls of Wisdom website which acknowledged the original post by Robert Lancaster to alt.games.civ2
"The amount of trade and the bonus payment you get for establishing a trade route between two cities with a caravan or a freight depends on quite a few factors. The formulas below contain all the details.
Trade = ( trade of home city + trade of destination city + 4 ) / 8
Note that it does not directly depend on city size or distance. The following (cumulative) modifiers apply:
Both cities are yours -50%
Freight instead of caravan +50%
Cities connected by road +50%
Cities connected by rail +50%
Cities on different continents +100%
Airports in both cities +50%
Superhighways in home city +50%
The one time bonus payment is calculated as follows:
Payment = ( ( distance + 10 ) x ( trade of both cities ) ) / 24
It increases if the destination city demands one of these goods (double these figures if the city is not yours):
Silver, Cloth, Wine +50%
Silk, Spice, Gems, Gold +100%
Oil +150%
Uranium +200%
The final bonus payment figure is then doubled during the first 200 game turns or until both Navigation and Invention are discovered. It is reduced by one third after the discovery of Railroad, and by another third after the discovery of Flight. "
"The amount of trade and the bonus payment you get for establishing a trade route between two cities with a caravan or a freight depends on quite a few factors. The formulas below contain all the details.
Trade = ( trade of home city + trade of destination city + 4 ) / 8
Note that it does not directly depend on city size or distance. The following (cumulative) modifiers apply:
Both cities are yours -50%
Freight instead of caravan +50%
Cities connected by road +50%
Cities connected by rail +50%
Cities on different continents +100%
Airports in both cities +50%
Superhighways in home city +50%
The one time bonus payment is calculated as follows:
Payment = ( ( distance + 10 ) x ( trade of both cities ) ) / 24
It increases if the destination city demands one of these goods (double these figures if the city is not yours):
Silver, Cloth, Wine +50%
Silk, Spice, Gems, Gold +100%
Oil +150%
Uranium +200%
The final bonus payment figure is then doubled during the first 200 game turns or until both Navigation and Invention are discovered. It is reduced by one third after the discovery of Railroad, and by another third after the discovery of Flight. "
). From one turn to another, the gold I got from trading with the foreign city dropped from 1000-2000 per caravan to 200-210
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