Thanks for the info, but that's not quite what I was getting at.

I'm not so much interested in the "player perspective" of how to make the most money (percentage bonuses, etc), but rather, I'm curious how the game actually figures out that BRUGE trades CLOTH with LONDON, rather than something else with someplace else, and WHY... obviously it has something to do with the goods that Bruge and London have, but I'd really like to know the specifics of how the game figures out that since province X makes cloth, the cloth should pass through province Y, where it is put on a ship and is transported by sea to province Z.