A commodity can be obtained by the city through industrial production, or trade. Some commodities require manufacture from a raw material which in turn must be obtained from the environment. Pottery in "Pharaoh", for example, is manufactured at a Potter from Clay, which is obtained at a Clay Pit. If the city does not have local supplies of a raw material, it may be able to import it and then manufacture the finished product. Alternatively, it can import the finished product directly, but this is usually much more expensive than manufacturing the goods locally.