What demand though? Nobody “buys” what public teachers produce - it’s a public service. It’s up to the state (and ultimately, voters) to decide what teachers make. And it’s even harder for teachers to advocate for themselves in states where teacher unions are banned.
There’s absolutely a supply demand cycle here. If wages are too low, teachers will do something else. School quality suffers, parents (may) make noise, politicians raise the wages (or do something else to appease their constituents).
