Long but well written:

https://www.city-journal.org/html/ho...ols-12102.html

"When school board representatives sit down with union officials to negotiate a labor contract,
neither party is under pressure to pay attention to worker productivity or the system's overall
competitiveness: if the contract allows some teachers to be paid for hardly working at all, and
others to perform incompetently without penalty, there is no real economic danger for either side.
After all, most of the monopoly's customers, the schoolchildren, have nowhere else to go."

Sad, but true.