Let's say I own a lawn care business, and you gladly accept work raking lawns for $10/hr@8 hr days, and you can rake 2 acres per day(or, $40 per acre). If I decide to plunk down a bunch of money and buy a turbine leaf blower, and you can now do the same job on 6 acres per day, except using the leaf blower for 6 acres is much less physically exhausting than raking 2 acres of leaves, how much money should I as the business owner owe to you for my own investment into increasing your productivity?