A simple way of doing that would be to slowly decrease the output of the city center as the city become larger.
For example:
Size 1, the city square gets 2 food, 1 shield, 1 commerce.
Size 2, the city square gets 2 food, 0 shield, 1 commerce.
Size 3, the city square gets 1 food, 0 shield, 1 commerce.
Size 4, the city square gets 0 food, 0 shield, 1 commerce.
Or something like that.
I'm not convinced its necessary for game play, though. Larger cities already have things like unhappiness which keeps them from getting too productive, plus they need lots of improvements.
For example:
Size 1, the city square gets 2 food, 1 shield, 1 commerce.
Size 2, the city square gets 2 food, 0 shield, 1 commerce.
Size 3, the city square gets 1 food, 0 shield, 1 commerce.
Size 4, the city square gets 0 food, 0 shield, 1 commerce.
Or something like that.
I'm not convinced its necessary for game play, though. Larger cities already have things like unhappiness which keeps them from getting too productive, plus they need lots of improvements.
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