Susan Jhirad writes: Lawrence Harmon argues that teachers unions are selfish to want to retain seniority. In fact, seniority helps our students. First, the prospect of job security itself attracts talented, well-educated people to the profession, despite relatively low initial wages and stressful work. Second, after years of practice, people usually become better at what they do, not worse. Third, the alternative — to allow administrators to decide whom to fire — is dangerous.
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