While there has been much talk about the racial achievement gap in test scores, there has not been sufficient attention paid to the racial gap in wages.

A new study by professors at the City University of New York finds that unionization is a successful strategy in reducing the racial wage gap.

This bears directly on educational outcomes, because children from economically secure families are likelier to be more successful in school than their peers who live in poverty.

A study released on Friday, noting the gains made by black union workers in New York City, said that raising the rate of unionization among black workers across the country would help narrow the racial pay gap.

The study, conducted by two professors affiliated with the Murphy Institute for Worker Education and Labor Studies at the City University of New York, which issued the report, described high unionization rates for black…