This is a fascinating idea. I enjoy games that employ resource management. This hits on that in simplistic terms which could become more complicated if folks get into the production chain. Iron Ore Mining Company - Steel Foundry (Furnace) - Production facility of some yet to be named item. The people at the end of this simple chain could manufacture farming tools, weapons, cutlery, or whatever else you can think of. But at the heart of this concept is the economy. What about the banking industry? What currency will you use? How is money earned recorded, consumed and earned? what rates of earning for various products?