One of campaigns I used to GM was centered around governing a small, elven village (it was D&D3.5 campaign but it shouldn't really matter). I thought about rules as they were needed, but it was too crude to work in a long campaign. Are there any systems that concentrate and/or elaborate on this matter so that there is enough information to make a campaign where PCs are rulers of a city/village?
EDIT: What I exactly ask for is rules for economics primarily. Things like:
- Population, changes of population, percentages of different social classes and how all of this modifies economic power of place, changes of people (deaths, people moving in-out, born children)
- Monthly/Weekly production of place (what produces), trade with other places (how well the trade goes, depending on relations with them)
- What does the governor need to take care of - Army, Guards, Peasants, Extending city (new buildings?), temples and religion (paying temples, how temples change people's relation to governor)
- And other similar stuff