Toward the theme of introducing more realistism into CIV IV, How about having states set their immigration/emigration status? If they are a leading state and have open status, the state gets bonus multipliers for scientific discovery and economic progress, but is more susceptible to espionage and maybe unhappiness.
In the real world, industrialized countries stagnate and, on average, get too old when they get too rich. This should lead to economic / productivity problems in the simulation. Openness to immigration would ameliorate the negatives. The AI tracks relative birthrates already.
If a backwards state has open immigration/emigration, it loses occasional population.
New faces that pop up in a lead civilization's cities might be of nationalities exporting population instead of the original AI.
In the real world, industrialized countries stagnate and, on average, get too old when they get too rich. This should lead to economic / productivity problems in the simulation. Openness to immigration would ameliorate the negatives. The AI tracks relative birthrates already.
If a backwards state has open immigration/emigration, it loses occasional population.
New faces that pop up in a lead civilization's cities might be of nationalities exporting population instead of the original AI.
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