I fear that I'm being overly dense to even ask this question...alas.
But all of these cool market supply/demand issues will be resolved by REAL fleets moving throughout the Sector right?
Fleets which will be carrying the desired supplies from the location with the surplus to the location with the demand?
Then if these fleets are assailed, the cargo recovered would naturally be the cargo which was being shipped due to this market system.
Anyways, sorry if that is old hat, but I didn't notice it being clearly laid out just now, maybe I overlooked it, or maybe I'm way off and this supply/demand chain will happen automagically.