The memento is applying the bonus production to your capital from the previous age. It also triggers on tech masteries and civics in addition to techs and civics masteries.
Edit: I think it may be contributing more than 15% of the cost as production as well. Getting wonders in 1 turn with overflow in Modern Age.
Edit: I think it may be contributing more than 15% of the cost as production as well. Getting wonders in 1 turn with overflow in Modern Age.
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