That's a good idea!
However, the prices do vary with time, so they should all be captured early in the game when they haven't been affected by your trading yet.
Secondly, supply volumes vary even more, and good import/export cargo in a certain port isn't always listed among the "major imports and exports".
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A sickened, sensitive shadow writhing in hands that are not hands, and whirled blindly past ghastly midnights of rotting creation (Nyarlathotep, H.P. Lovecraft)
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