A pre-k classroom in Brooklyn. When it comes to math and science scores, the United States lags many other advanced nations. Credit Ozier Muhammad/The New York Times

A pre-k classroom in Brooklyn. When it comes to math and science scores, the United States lags many other advanced nations. Credit Ozier Muhammad/The New York Times

Study after study has shown a yawning educational achievement gap between the poorest and wealthiest children in America. But what does this gap costs in terms of lost economic growth and tax revenue?

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