Profits from domestic trade are not that good so you might replace them with any upgrade.
You should remember about two profits that a harbor gives you.
Seaport
265 production points
+2to food and gold
+25%experience for all naval units trained in this city.
Faster training for fleets and armadas.
Shipyard
Maintenance
2 Gold
Bonusproductionis equal to the adjacency gold bonus.
Project - Harbor Shipping
This project provides gold and Great Admiral points.
This always works to your advantage.
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