Caravans are economic units in Age of Mythology that can be trained at the Market once the Heroic Age is reached. It is used to trade between the Market and a selected friendly Town Center. The Town Center 'gives' gold to the Caravan, which is added to the player's stockpile when the Caravan returns to the Market. As the distance traveled increases, the amount of gold that is generated increases geometrically. The species of Caravan varies between civilizations. See these individual entries for more details: