[cbk1994]

Ideally I'd like to do it somewhat like it's done in real life; everyone relies on everyone else, and people are motivated by "greed"/profit. If, for example, a wood workshop making furniture needed wood, they would be willing to pay a lot for it, and then others would take up the opportunity and go chop some trees.

I don't really know how well this would work, though. It might be best to keep it to player-independent jobs and basic stocking businesses.