Most experts agree that a primary cause of the Great Convergence was the interplay between technological advance and the educational innovations (especially the public high school) that emerged from the Progressive Era around 1910. Other things being equal, more widespread education means more equality, as the increased supply of high-skilled workers puts downward pressure on higher incomes, while the decreased supply of low-skilled workers puts upward pressure on lower incomes. That dynamic is offset by technological progress, which increases the demand for (and hence the incomes of)
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