Players are advised to build Markets fairly early in the game, it is generally good to have around 4 Markets. This allows for constant selling of resources while also upgrading at least one Market at a time in the aim of producing gold without spending resources.
At level 4 a Market will start producing gold constantly, at a rate of 4 per hour, going up to 18 per hour at level 6 and 50 at level 10. Iron cannot be traded until a Market is at level 8 or above and is required to upgrade that high.
Resources are traded at the market at a ratio of 1 gold for 2 wood or crop and 5 gold for 1 iron.
All structure and unit stats, cost to upgrade per level, and other abilities can be seen on the Official Database Entry
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