In my current game, two of my players are always on the lookout for "get rich quick" schemes and they are looking into establishing trade routes between cities to make money.
That led to great roleplay moments where they search for raw materials and finished products producers and bargain for prices, but I wonder if there are rules for this kind of thing. Maybe some other game system than D&D 3.5 includes commerce and can be used as inspiration?
- What can be the expected profit margin?
- How can randomness be included in the process? (Caravans ambushed, ships sinking, market crash, etc.)