There is an important category of near-zero-marginal-cost businesses that rarely or never lose money on deals. Think lawn care, Lasik, massage, leg waxing, hai

There is an important category of near-zero-marginal-cost businesses that rarely or never lose money on deals. Think lawn care, Lasik, massage, leg waxing, haircuts, and so on - businesses with airline-esque cost structures. They are also the most profitable for the deals companies.