Domestication is a technology in Age of Empires that can be researched at the Market once the player reaches the Tool Age. This Technology allows Farms to produce 75 more Food. It costs and to research this technology. It is recommended to get this upgrade before building any farms, as the upgrade cannot improve the productivity of farms that were already built. To research more farming upgrades such as the Plow and Irrigation, this economic upgrade must be researched beforehand.