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Traders will impact the building they are assigned to in a strong way.(… will be implemented alter)
Upon reaching lvl 3 productivity, the trader gains ONE of these skills:
Overclocking Overlord: Increase production output by 5% for each productivity level
Efficiency Guru: Decrease input consumption by 10% for each productivity level
Tree Huger: Decrease carbon emissions by 20% for each productivity level
Aging
Your traders will age in time, and retire at some point. But do not worry, they generally last longer then eras and you can keep your traders in-between eras.