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Trade is a tier three technology that unlocks the Customs House, a building that produces two stars per turn for each adjacent Port, and the Wealth task, which awards the Emperor's Tomb once at least 100 stars are accumulated.

For Polaris, Trade unlocks the Ice Bank, a building that produces three stars per turn for every 20 frozen tiles in the world, and the Wealth task.

For Cymanti, Trade unlocks the Clathrus, a building that produces one star per turn for each adjacent Algae, and the Wealth task.

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