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There are currently 4 main resource categories. Hovering over resource icon displays amounts produced and spent over the last 30 days:
Raw resources compreend varieties of product that don't need any crafting to be obtained, altho some of them need specialized buildings to be produced.
This categorie compreends all non-food resources that need to be crafted in order to obtain, wich can be done either in workshop or specialized buildings.
This categorie compreend all rsources that have nutritional value, plus alchoolic beverages, being therefor able to feed your population and/or increase happiness.
This categorie compreend advanced items that need research and crafting and can be used to produce other research items, upgrade tools and weaponry. For furter information about special items in this branch, consult the tools page.