Agriculture was the foundation of the Persian economy—surpluses were necessary to support military forces, government administrators, and residents in the cities.
• Empire controlled fertile land in Mesopotamia, Egypt, Anatolia, and northern India.
• Imperial court consumed almost 800,000 liters of grain per year, in addition to vegetables, fruits, meat, poultry, fish, oil, beer, wine, and textiles.
• Persian Royal Road and sea routes through the Red Sea, Persian Gulf, and Arabian Sea assisted in trade throughout the empire.
• Markets in large cities, such as Babylon, also housed banks and companies that invested capital in commercial ventures.