HOW DEEP IS THE TEACHER BENCH?
On most sports teams, coaches assess players in part by considering who is available to replace them. Teams with “deep benches” have more leeway in making personnel changes, because quality replacements are available.
The same goes for teaching. Those who aggressively wish to start firing larger numbers of teachers every year rely on an obvious but critical assumption (often unstated): that schools and districts can find better replacements.
In other words, it is both counterproductive (and very expensive) to fire teachers if you can’t replace them with a more effective alternative. Even those few commentators who have addressed this matter sometimes ignore another important fact: The teacher labor market is about to change dramatically, with a massive wave of
