I thought of a new "type" of buildings:
Free X.
If your nation is really rich (which it is in civ usually in the later game), it could give its people something back. I thought of a set of buildings that require the palace to be build and cost
a lot of maintenace. it would be best if it were something like: "2 gold per pop (empire-wide)". Therefore, those Buildings gives a lot of Happiness and probably health, science, productivity, decrease rebelliouness etc. For example:
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Free Water Supply: costs 5 gold per pop, +2 Happyness in every city, -5 Flamability in every city, + 2 health in every city.
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Free Electricity: -5 gold per pop, +2 Happyness in every city, +5% production in every city. [May get boni with Wireless Electricity etc. Also, could get more expensive with Computers, Green Civic etc or less expensive with Fusion Power]
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Free Internet: -5 gold per pop, +2 Happyness in every city, +5% research in every city. [May get boni with later techs like virtual community etc]
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Free Housing: -20 gold per pop, +5 Happyness in every city, -10 disease in every city.
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Free Education: - 15 gold per pop, +25% Education in every city, +2 happyness per city, free School, Highschool, University etc in every city.
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Free Entertainment: -10 gold per pop, +5 Happyness in every city, +10% Culture in every city, free Theater, Operahouse, Artist Gallery etc in every city.
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Free Television: -5 gold per pop, +5 Happyness in every city, -5% Culture in every city.
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Free Food Supply: -5 gold per pop, +5 Happyness in every city, +10% Food in every city, +2 Unhealthiness per City.
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Free Medical Care: -20 gold per pop, + 5 Happyness in every city, -200 Disease per turn.
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Free Transportation: -10 gold per pop, +3 Happyness in every city, -200 Air Pollution in every city, +5% Production in every city. [Increasing boni with Personal Rapidtrain, Skyroads etc]
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Free Minimum Wages: -7 gold per pop, + 10 Happyness, -1% Production.
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Free Plastic Surgey: -5 gold per pop, +10 Happyness.
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Free Personal Robots: -30 gold per pop, +10 Happyness, +20% Production [Increasing boni with Cognitive Robots etc]
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Free Childcare: Pop Boost
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Free Parental Leave: Pop Boost, -Prodcution, - Science - Culture, +
Maybe the costs are too low. They should be a hard decision to build. But for a giant map you easily end up with 50 cities with 50+ pop each, meaning for Free Education a total cost of 15*50*50= 37500 gold per turn. Plus the costs of 50 Universities, Schools etc.
Free Education or Free Entertainment offer free buildings in all cities. So it would be awesome if you could implent a new tag that makes it possible to give buildings "X gold one time cost when build".