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Commerce represents the income from the trade system for a civ each turn, and is divided into Domestic trade and World trade. A civilization's wealth is a value that represents its total affluence.
Commerce starts after researching the primitive trade knowledge node, and after that, each civilization can start to grow their wealth through commerce and the accumulation of luxury resources; their wealth value is the sum of all of them. The Commerce income is divided into Domestic trade and World trade.