&gt;  if teacher quality dominated everything else, then a teacher getting poor scores out of a class of poor black kids, relative to another teacher getting great scores out of a class of rich asian kids, would be entirely to blame.<p>Well, using the weaker-but-still-absurd claim that teacher quality matters more than student quality (but isn&#x27;t necessarily the only thing that matters at all), that teacher would only be almost entirely to blame.<p>However, switching the teachers around should cause the poor black kids to start outscoring the rich asian kids.