Creaming Versus Cropping: Charter School Enrollment Practices in Response to Market Incentives

Abstract
Proponents of school choice present market-based competition as a means of leveling disparities between race, class and performance in public school systems. Opponents see school choice as threatening to exacerbate this problem because competition for students will pressure individual schools into targeting students with the highest performance and the least encumbered with personal and social disadvantages. We suggest that some charter schools, by background and affiliation, are likely to be more market-oriented in their behavior than others, and test the proposition that market-oriented charter schools engage in cream-skimming while others disproportionately serve highly disadvantaged students. Comparing student composition in market-oriented charter schools, nonmarket-oriented charter schools, and traditional public schools in Washington, DC, we find little evidence that market-oriented charters are focusing on an elite clientele, but they are less likely than the other two types of schools to serve some high need populations. Rather than skimming the cream off the top of the potential student population, market-oriented charter schools may be “cropping off” service to students whose language or special education needs make them more costly to educate.

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