• Open the «NPC trading» tab of the Marketplace: each trade costs 3 gold. It is not available in Wonder of the World villages.
• Enter how much you want of each resource. If the total asked is more than you have, every amount is reduced in the same proportion; the page does not let you go over the warehouse and granary capacity.
• The NPC button on construction, training, research and celebration pages opens the trade with the exact amounts already filled in.
• The 25% button balances the four resources to a quarter each.
• From the village overview you can balance at 25% every village with a Marketplace at once, for 3 gold in total.
• In the Great Granary you can turn wood, clay and iron into crop, one for one, for 4 gold, up to the free space of the granary.

See also: Marketplace Automations