Bad teachers have a negative impact on learning, equivalent to fourth graders missing 40% of school. Good teachers lead to lasting gains and higher income.
Teachers who are not effective in the classroom have a significant effect on the learning process, and not in a positive way. According to a joint study by economists at Harvard and Columbia universities, the overall effect of a bad teacher is similar to that of fourth graders missing 40 percent of their school year. Other studies indicate that a good teacher can lead to gains in the learning process that will have lasting effects. Poor teaching over the course of several years can leave students unprepared for college attendance, if they even have the desire to pursue a college degree.
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According to a study conducted by the Tennessee Value-Added Assessment System in the United States, students taught by poor teachers for three consecutive school years show an average achievement gain of 29%. In contrast, students who have competent teachers for three consecutive years show an average performance gain of 83 percent.
Dating a good teacher in fourth grade increases the chances of students eventually attending college by 1.25 percent and helps reduce the incidence of teen pregnancy by about the same percentage.
Students who have consistently good teachers from fourth grade onward are likely to earn a higher income per year throughout their adulthood than students who struggle with below-average teachers. According to the Harvard study, quality teaching can lead to earning an extra $25,000 over a student’s lifetime.
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