By Patricia Cohen

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?

That’s what researchers at the Washington Center for Equitable Growth set out to discover in a new study that concluded the United States could ultimately enrich everybody by improving educational performance for the typical student.

When it comes to math and science scores, the United States lags most of the other 33 advanced industrialized countries that make up the Organization for Economic Cooperation and Development, ranking 24th, far behind Korea, Poland and Slovenia.

Moving up just a few notches to 19th — so that the average American score matched the O.E.C.D. average — would add 1.7 percent to the nation’s gross domestic product over the next 35 years, according to estimates by the Washington Center, a nonpartisan, liberal-leaning research group focused on narrowing inequality. That could lead to roughly $900 billion in higher government revenue, more than making up for the cost of such an effort.

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