There are two types of resources in the game - raw materials and commodities. The higher the level of industrial development of the area, the more expensive commodities you will be able to produce.
Please note, some raw materials reserves are exhaustible. For example - when you run out of wood or coal reserves in your area, you will need the help of players with the role of a Forester or Geologist.
Some resources can only be obtained in certain climatic zones.