arnwyn said:There are no economic/trading rules for 3e, except for the basic one found in the Seas of Blood book. If that one doesn't cut it for you (it didn't for me), then there's nothing else.
This is one of my pet peeves, and has been for years (along with the lack of kingdom management rules). So far, the old OD&D books mentioned above (especially the Minrothad Guilds) are your best bet if you're looking for a somewhat detailed system.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.