The case for performance pay

Nicholas Kristof in the NY Times writes:

A landmark new research paper underscores that the difference between a strong teacher and a weak teacher lasts a lifetime. Having a good fourth-grade teacher makes a student 1.25 percent more likely to go to college, the suggests, and 1.25 percent less likely to get pregnant as a teenager. Each of the students will go on as an adult to earn, on average, $25,000 more over a lifetime — or about $700,000 in gains for an average size class — all attributable to that teacher back in the fourth grade. That's right: A great teacher is worth hundreds of thousands of dollars to each year's students, just in the extra they will earn.

The study, by at and Columbia , finds that if a great teacher is leaving, parents should hold bake sales or pass the hat around in hopes of collectively offering the teacher as much as a $100,000 bonus to stay for an extra year. Sure, that's implausible  — but their children would gain a benefit that far exceeds even that sum.

Conversely, a very poor teacher has the same effect as a pupil missing 40 percent of the school year. We don't allow that kind of truancy, so it's not clear why we should put up with such poor teaching. In fact, the study shows that parents should pay a bad teacher $100,000 to retire (assuming the replacement is of average quality) because a weak teacher holds children back so much.

That is a staggering figure. A poor teacher has the same impact as a 40% truancy rate. This is why bad should not be paid the same as good teachers. A flexible pay scale would allow principals to send messages to bad teachers by not giving them automatic payrises. It would encourage them to leave the profession. Also it would allow principals to pay the good teachers more.

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