/**
 * @typedef {Object} BuyData
 *
 * @property {boolean} local
 * Indicating whether the turnips were purchased locally.
 *
 * @property {string} [label]
 * String to mark where the turnips were purchased from.
 *
 * @property {number} price
 * Buy price of the turnips (between 90 and 110, inclusive).
 *
 * @property {number} quantity
 * The number of turnips purchased.
 */