"Lest you miss the point, this paper shows that the same methods that purport to show an effect of teachers on student achievement also show an effect of teachers on student height. But the effect of teachers on height is almost surely spurious. So the effect of teachers on achievement may also be spurious.
1. This provides vindication for Jerry Muller’s The Tyranny of Metrics.
2. It provides support for the Null Hypothesis.
3. The research that seemed to show a big effect of teachers (e.g., Raj Chetty on kindergarten teachers) got a lot of play in the press. But that had social desirability bias going for it. I would be surprised if this paper receives similar notice."