Minecraft wiki entry for Zombie_Villager, associated text: A newly-cured villager, if it had a profession prior to being zombified, offers a trading discount to the player who administered the cure. These discounts are permanent. If a villager is cured more than once, the discounts get deeper until the price reaches the minimum of one emerald. Villagers near the cured villager are also affected but offer fewer, smaller discounts.