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Villagers gather Coin from Rice Paddies faster.
—In-game description

Rice Surplus is a technology in Age of Empires III: The Asian Dynasties that can be researched at the Rice Paddy once the Commerce Age is reached. Once researched, it allows Villagers to gather coin from Estates and Rice Paddies 10% faster. Rice Trade is the further upgrade of this technology.

Rice Paddy technologies
FoodPaddy Threshing · Irrigation Channels · Dike-Controlled Canals · Mechanized Rice Cultivation
CoinRice Surplus · Rice Trade · Rice Markets · Rice Exports · Collective Economy