This is my aqua trade circle, it benefits greatly to happiness and population.
If you have any of two of those resources com on in!
Gold
Silver
Gems
Coal
Fish
Furs
Wine - Emijin
Sugar - Emijin
Cattle
Spices
Pigs
Iron
BRs:
Fast Food
Fine Jewelry
Affluent Population
Steel
Benefits:
+$8.00 income
- 5% technology cost
+11.5 happiness
+15% land area
+23% solider efficiency
-6% infra purchase cost
+24.5% population
-15% land purchase costs
3 times natural nation growth
+8% purchased land area
-$0.50 per solider upkeep cost