Before I can create the source of food and cash I must create a customizable system which controls world events such as the change of a seasons. (Your wheat may grow to eventually be harvested for food, or some seasons the horde of monsters may be more aggressive, or it may rain more often in winter...). The technology advances and the game pacing need be controlled. (At which stage does the more difficult monsters besiege your town walls?).
This world events controller need to be highly configurable to cater for a variety of scenarios and game types.
