In addition to the 'muliple improvements per city' idea:
• Give cities the option to build multiple improvements when they become bigger. City of 10 can have 1 Marketplace, city of 18 can hae 2 Marketplaces, city of 26 can have 3 marketplaces etc.etc.
• 1 Granary in a 8 people city works 100% but one granary in a 9+ city works 70% and one Granary in a 15+ city works 50%. Now you're forced to build a 2nd Granary when your city become 9.
• City improvements must become inactive when technology gets better. (like wonders don't work forever) and be replaced with others.
• Give cities the option to build multiple improvements when they become bigger. City of 10 can have 1 Marketplace, city of 18 can hae 2 Marketplaces, city of 26 can have 3 marketplaces etc.etc.
• 1 Granary in a 8 people city works 100% but one granary in a 9+ city works 70% and one Granary in a 15+ city works 50%. Now you're forced to build a 2nd Granary when your city become 9.
• City improvements must become inactive when technology gets better. (like wonders don't work forever) and be replaced with others.
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