{
  "tiers": [
    {
      "trades": [
        {
          "wants": [
            {
              "item": "minecraft:wheat",
              "quantity": {
                "min": 18,
                "max": 22
              }
            }
          ],
          "gives": [{ "item": "minecraft:emerald" }]
        }
      ]
    }
  ]
}
