Interestingly, the biggest problem with teacher turnover is scarcely mentioned.  I teach in the bush, and when the staff is constantly turning over it means you get tons of new teachers.  New teachers are generally not very effective teachers.  They struggle with classroom management, learning new curriculum and how to teach the material most effectively, culture shock and figuring out how to reach kids from a new culture, etc.  Then they leave when they are just starting to get effective and another newbie takes their spot.  : - (  This is a huge part of explaining why kids in rural Alaska lag so far behind their same-aged national peers in terms of academics, and it deserved much more of a mention in the article.