Public school districts are facing twin challenges: maintaining a labor supply of qualified teachers while shoring up the deteriorating system that compensates them. Keeping public-school teachers' pensions plans flush is expensive, and it accounts for a growing share of education spending. In some states, public charter schools provide an…

Teacher pensions consume a substantial portion of school budgets. If relatively generous pensions help attract effective teachers, the expense might be justified. But new evidence suggests that current pension systems, by concentrating benefits on teachers who spend their entire careers in a single state and penalizing mobile teachers, may…