“It’s not that you don’t have some terrifically talented people going into teaching. You do,” said Richard J. Murnane, an economist at Harvard University’s Graduate School of Education. “The issue is that you don’t have enough. And many are the most likely to leave teaching, because they have lots of other opportunities.”
A study co-written by Murnane and published this year reports that minorities and poor children are most likely to be taught by teachers with weak academic backgrounds or little preparation. Overall, the proportion of women who pursue teaching after college, as well as the caliber of recruits, has declined significantly since the 1960s.