Villagers at the Tribal Marketplace generate XP. Reduces cost of native support shipments.
—In-game description

Cooperation is a Big Button technology in Age of Empires III: Definitive Edition that is available to the Haudenosaunee and Lakota, and can be researched at the Tribal Marketplace once the Commerce Age is reached.

Once researched, Villagers will trickle 0.1 XP. Despite the in-game description, it can be clearly seen that any Villager doing any type of resource gathering generates the same 0.1 XP trickle.

It also reduces the cost of "Support" Home City Cards (e.g. "Mohawk Support", "Dakota Support", etc.) by 10%, and makes them arrive 33% faster.

With the Industrial Age Old Ways Home City shipment, the cost is reduced to 300 food, 300 wood.

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