EDIT: Filled
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Info about this trade circle:
[quote]Aluminum, Cattle, Fish, Iron, Lumber, Marble, Pigs, Spices, Sugar, Water, Wheat, Uranium
Bonus Resources: Beer, Construction, Fast Food
Statistics:
Citizens: +30.56%
Income: +$32.00
Increases number of citizens per mile before population unhappiness by 50.
Infra Cost/Upkeep: -31.99%
Land (Purchased): +19.07%
Land Cost: -14.5%
Environment: +1
Soldier Efficiency: +38%
Soldier Cost/Upkeep: -$3.00 / -$0.50
Tank Cost/Upkeep: -5%
Aircraft Cost/Upkeep: -8%
Aircraft Limit: +10 (tech >5)[/quote]
Overall it's pretty much the ideal balance between infra cost/upkeep and income (maximizing net income and growth), though I haven't factored in the possibility of Moon/Mars resources here.