There's a big difference between public and private sectors here, with teaching being a good example. Sure, hiring the best dishwasher in the world isn't worth it, because you won't lose much if anything by getting some random kid to do it and paying minimum wage. But teaching isn't like that: they're not all the same. Hiring a great teacher gets you real, substantial gains over hiring a lousy teacher. There isn't a large, highly competitive pool of people entering the profession and fighting for jobs because teaching jobs don't pay well. And they don't pay well because salaries are constrained by government budgets. If we decided we wanted much better teachers, we could make more money available. That money would attract stronger candidates to the profession and get us better teachers. And those better teachers, replacing bad teachers, would make a real, tangible difference to the country. But we don't value teachers, so we don't make the money available.