How about this: A device's component is a Leaf Component if it: 1. Is available on the open market (without special contracts or minimum order quantities) 2.

How about this: A device's component is a Leaf Component if it: 1. Is available on the open market (without special contracts or minimum order quantities) 2. Can be replaced without specialist equipment or knowledge 3. Contains components that are not themselves Leaf Components A device's Cost To Repair is the List Price (price on the open market, before any discounts) of the most expensive Leaf Component. A device is taxed based on the square of the device's Cost To Repair.