What to export or import....
Fabric: wool, linnen, silk...
Wood: raw-material, furniture
Metals: iron, gold, silver, copper...
Wine, beer, mead, spirits...
Animals: horses, sheep, swine, cows...
Coloring-powder (for fabric, ink...)
Raw-material to make fabric: unprocessed wool, linnen, silk...
Glass: Windows, figurines, glasses, raw-material...
Tea (not sure about my spelling here, but I mean the hot drink Englishmen drink instead of coffee!)
If a fighter has a +1 sword that only gives that plus one if he does an exhausting practice routine in the morning, he's liable to ditch the magic sword and just use an old fashioned chunk of steel. Rather than being wore out and need to rest a couple hours before he gets started just in case he needs that plus one, he could just strap on a blade and ride off without having to deal with all the issues. (From Something Agar said)