NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Estimating the Cream Skimming Effect of School Choice

Joseph G. Altonji, Ching-I Huang, Christopher R. Taber

NBER Working Paper No. 16579
Issued in December 2010
NBER Program(s):   CH   ED   LS   PE

We develop a framework that may be used to determine the degree to which a school choice program may harm public school stayers by luring the best students to other schools. This framework results in a simple formula showing that the "cream-skimming" effect is increasing in the degree of heterogeneity within schools, the school choice takeup rate of strong students relative to weak students, and the importance of peers. We use the formula to investigate the effects of a voucher program on the high school graduation rate of the students who would remain in public school. We employ NELS:88 data to measure the characteristics of public school students, to estimate a model of the private school entrance decision, and to estimate peer group effects on graduation. We supplement the econometric estimates with a wide range of alternative assumptions about school choice and peer effects. We find that the cream skimming effect is negative but small and that this result is robust across our specifications.

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Document Object Identifier (DOI): 10.3386/w16579

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