Minecraft wiki entry for Hero_of_the_Village, associated text: Level I Hero of the Village decreases the cost of the first item in a trade by 30%; each additional level decreases the price by an additional 1⁄16 (6.25%). In Survival, the maximum level is V‌[JE only] or I‌[BE only], giving discounts of 55% and 30%, respectively. Nevertheless, one can use commands to give higher levels of the effect. Hero of the Village XII gives a discount of 98.75%, decreasing all prices to 1. No matter how large the discount is, the final item count in the trade is always at least one, never zero. In other cases, the decrement is the discount ratio multiplied by the original count rounded down or rounded up if the decrement is less than 1.