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Shipments come faster.
—In-game description

Merchant Marine is a Consulate technology in Age of Empires III: The Asian Dynasties that can be researched by the Japanese if they choose the Spanish as their ally once the Colonial Age is reached. Once researched, it reduces the time it takes for Home City shipments to arrive by 50%, essentially making them arrive at double speed.

Strategy

Merchant Marine synergizes well with the Good Faith Agreements Home City Card which allows Consulate technologies to be researched twice as fast with a 40% discount.

Consulate shipments and technologies
Consulate british British2 Surgeons · 4 Spies · 5 Petards · British Brigade
Consulate dutch DutchChurch Wagon · Bank Wagon · Arsenal Wagon · Livestock Pen Wagon · Dutch Brigade
Consulate french FrenchFood Crates · Wood Crates · Coin Crates · French Brigade
Consulate germans GermansFood Trickle · Wood Trickle · Coin Trickle · German Brigade
Consulate japanese IsolationMilitary Rickshaw · Bushido Principles · Clan Offerings · Meiji Restoration
Consulate ottomans Ottomans6 Azaps · 4 Villagers · 2 Great Bombards · Ottoman Brigade
Consulate portuguese PortugueseFishing Fleet · Exploration Fleet · Expeditionary Fleet · Portuguese Brigade
Consulate russians RussiansBlockhouse Wagon · Fort Wagon · Factory Wagon · Russian Brigade
Consulate spanish SpanishMerchant Marine · Nanban Trade · Bullionism · Spanish Brigade
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