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Rothstein, J., (2005)
‘Does Competition Among Public Schools Benefit Students and Taxpayers?
A Comment on Hoxby (2000)’
NBER Working Paper no. 11215
- Reanalyses the data from Caroline Hoxby’s influential 2000
AER paper ‘Does Competition Among Public Schools Benefit Students
and Taxpayers?’, which used instrumental variable analysis to show
a significant effect of Tiebout school choice on public school productivity.
- Hoxby famously used the number of larger and smaller streams in
metropolitan areas as instruments for the level of Tiebout choice
(hence competition)
possible, arguing that as historical barriers to travel, areas with
more streams will
have more fragmented school districts, increasing choice.
- The author
changes Hoxby’s specifications to test the robustness
of her results, and conducts an exhaustive search for coding errors
and inadequate
instruments.
Key results:
- Many of the author’s alternative specifications give results
which differ from Hoxby’s, with the coefficient on competition
frequently not statistically different from zero.
- He points out that
Hoxby’s dataset incorrectly assigns some
Ohio school districts to an incorrect metropolitan area.
- He questions
Hoxby’s use of larger and smaller streams as
instruments for the level of Tiebout choice. He finds that the coefficient
on larger streams (which he argues should have been a bigger barrier
to travel than smaller streams) often shows a negative impact on choice.
- He argues that Hoxby uses only streams’ sources in her instruments,
not all the areas through which a stream flows.
- He suggests that since
high-scoring students may be more likely to attend private schools
in areas with low choice/poor public schools,
there may be a self-selection problem. He includes private school
students in the sample to correct this, and finds choice effects
are no longer significant.
- The author concludes that it would be premature
to conclude that schools respond to Tiebout competition by raising
productivity.
- This comment, and an earlier one by the same author,
have drawn a vigorous response from Professor Hoxby.
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