Trade Status
Again toward the theme of introducing more realism, how about having each Civ set its trade status (changeable every few turns) after the building of Adam Smith's Stock Exchange?
States with more open status get a boost to research, and extra economic growth, but suffer more unrest in selected cities and are more vulnerable to espionage and maybe trade embargoes in selected areas.
States with closed status do not get the bonuses and spend more resources on farm subsidies. When more than half of the states are in "closed" mode, all states suffer a 25% productivity hit.
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