单选题
The annual Phi Delta Kappa/Gallup poll of attitudes towards public education released this week found that a majority of Americans feel it is important to put a "qualified, competent teacher in every classroom". Bob Chase, president of the National Education Association (NEA), the main teachers' union, wasted no time in pointing out that this will require raising teachers' salaries so that more qualified candidates will enter the profession and stay there. A study by two economists suggests that the quality of America's teachers has more to do with how they are paid rather than how much. The pay of American public school. teachers is not based on any measure _of performance; instead, it is determined by a rigid formula based on experience and years of schooling. factors massively unimportant in deciding how well students do. The uniform pay scale invites what economists call adverse selection. Since the most talented teachers are also likely to be good at other professions, they have a strong incentive to leave education for jobs in which pay is more closely linked to productivity. For dullards(笨蛋), the incentives are just the opposite. The data are striking: when test scores are used as a proxy (代替物) for ability, the brightest individuals shun the teaching profession at every juncture. Clever students are the least likely to choose education as a major at university. Among students who do major in education, those with higher test scores are less likely to become teachers. And among individuals who enter teaching, those with the highest test scores are the most likely to leave the profession early. The study takes into consideration the effects of a nationwide 20% real increase in teacher salaries during the 1980s. It concludes that it had no appreciable effect on overall teacher quality, in large part because schools do a poor job of recruiting and selecting the best teachers. Also, even if higher salaries lure more qualified candidates into the profession, the overall effect on quality may be offset by mediocre teachers who choose to postpone retirement. The study also takes aim at teacher training. Every state requires that teachers be licensed, a process that can involve up to two years of education classes, even for those who have a university degree or a graduate degree in the field they would like to teach. Inevitably, this system does little to lure in graduates of top universities or professionals who would like to enter teaching at mid-career.