Someone did a study about how much money it costs to deal with the crazy amount of teacher turnover in many districts. It's here: http://www.nctaf.org/resources/demonstration_projects/turnover/TeacherTurnoverCostStudy.htm and it's sad. You can also calculate the cost of teacher turnover in your particular school or district here: http://www.nctaf.org/resources/teacher_cost_calculator/teacher_turnover.html
One might wonder - if it costs SO MUCH to replace the teachers who leave, why wouldn't you just treat the teachers you have better so they wouldn't leave?? Then you could spend the money on something useful, AND you'd keep experienced teachers. Does it really take rocket scientists to figure that out? Maybe, because the administrations in school districts really really don't get it.
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