I really have a nagging suspicion that each trader is independent (ie: rare material traders are not linked to the materials trader) and likewise, whatever that runs the economic algorithms do not seem to be aware that a bunch of 10 parchments = 10 X 1 parchments.
generik, how about keeping all the trader/economy/farming related topics in one thread? Your enthusiasm is great, but it's getting really difficult to keep track of all the different threads you start on those topics.