"Settlers are produced faster."
In-game description

Abbasid Market is a technology in Age of Empires III that is unique to the Ottomans and can be researched at the Mosque once Koprulu Viziers is researched and the Colonial Age is reached. Once researched, it reduces the time at which Settlers are spawned from Ottoman Town Centers by 8 seconds (for a total of 18 seconds with Millet System and Koprulu Viziers).

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