Local Economy?
Can anyone recommend a system that deals with the maximum amount of wealth there is in a town based on its size/population?
EG: You come out of a borderlands dungeon overflowing with items and gems, and you make it back to the nearest hamlet... you can't just sell all that stuff because there's only 30 people there and one store. So, if you want to unload your loot, you need to go to a bigger population center.
That sort of thing.