"Mr. Chetty and his colleagues [...] estimate that a standout kindergarten teacher is worth about $320,000 a year. That's the present value of the additional money that a full class of students can expect to earn over their careers. This estimate doesn't take into account social gains, like better health and less crime." -- David Leonhardt, 2010-07-28 in The New York Times (writing about a study by Raj Chetty of Harvard, looking at adult differences between people who had been part of another study on early education in the 1980s)
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