Well, actually, much is not discussed. First and foremost, the narrative is about public school teachers. How do private schools rate, and what are the ranges and mitigating factors?

With public schools, the salaries are set by law by political process, not by the marketplace. In particular, every teacher is paid the same. Tha can be adjusted for seniority, perhaps. And it varies by states. And it can vary within a state by independent school district, if they have those. But it is still a political decision, the result of an elected board or an elected legislature; and it is all paid for by bonds voted for in open elections.

On the other hand, as a technical writer here in Austin, Texas, since 2012, I have worked for $50 per hour on a 1099 for a big company and $28 on a W-2 contracted to the State. (The state dodged the higher $38 per hour by classifiying me as a "document specialist" rather than a "technical writer." But I chose to work for $28 rather than not work at all.) This time around, I was offered $38 and $45 and a couple in between. I chose the lower rate, but it comes with an easier commute and a good learning experience. Money is like Number 5 on my Maslow Hierarchy. I have other needs: I am really big on self-actualization. Whatever my values are, though, I can shop for them, job by job. Since 2012, I have had ten different contracts. Glassdoor, Indeed, and LinkedIn not only bring me job offers, I can see the pay rates posted by others.

Teachers get none of that. It is a different world for them. And it would be for me, too, if my work were defined by law, and my wages were set by the government and approved by the voters.