Here are details about the study Klein cites in his article, showing how seniority-based layoffs especially screw poor and minority students (see the sentence I've highlighted below):

Seniority-based layoffs affect more poor, minority students

Seattle, WA, May 21, 2010 - K-12 school districts that lay off teachers by seniority, a policy known as "last in, first out," disproportionately affect the programs and students in their poorer and more minority schools than in their wealthier, less minority counterparts.

Looking at the 15 largest districts in California, researchers at the Center on Reinventing Public Education found that teachers at risk of layoffs are indeed concentrated in schools with more poor and minority students.

In these districts, if seniority-based layoffs are applied for teachers with up to two years' experience, highest-poverty schools would lose some 30 percent more teachers than wealthier schools, and highest-minority schools would lose 60 percent more teachers than would schools with the fewest minority students.

The analysis concludes: "Where districts seek to minimize the effects of budget reduction policies on students . . . it is clear that the disproportionate impact of seniority-based layoffs on high-poverty and high-minority schools must be considered."

Published by the Center on Reinventing Public Education at the University of Washington, The Disproportionate Impact of Seniority-Based Layoffs on Poor, Minority Students can be downloaded at www.crpe.org.

------------------