It seems like almost every day more evidence comes in showing that teachers are the most important single factor when it comes to education quality. While that makes intuitive sense, it is also critical to have empirical evidence to support it. A better understanding of the central role that teachers play will help us focus reform efforts and target resources more effectively. It also confronts us with a major challenge: there are some seven million teachers in Latin America and the Caribbean, according to a recent report by the World Bank, representing 4 percent of the region's total labor force and 20 percent of its professional workers, and their combined salaries are equivalent to nearly...
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