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How do goods work after reaching the Modern Era? What are refined goods?

After reaching the Modern Era in the game, goods are split into two separate categories: Refined and unrefined goods. 

Unrefined goods can still be produced the same way you always produced them, so goods buildings, Great Buildings and city incidents may grant you those goods.

Refined goods on the other hand can only be made with new goods buildings in your city. Typically, they will take two unrefined goods and produce a refined good from them.