In civ 2 marketplaces gave you +50 economy output, this amount doubles when you build a bank, stock exchange ect. I have a new proposition to put forward - what if an ancient library increases your city economy output by 12%, then a medieval library increases it again by 24%, a renaissance university increases the city science by 48%, and overall science by an extra 12%. A modern university could then increase your city science by 96%, and overall science by 24% plus give you a 8% city gold output bonus. Something like that anyway.
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