The United States spends a lot of money each year on public schooling. As a percentage of GDP, government expenditures on public education (five percent) exceed the amount we spend on defense (four percent) or welfare (two percent). But how do we know if we are getting our “money’s worth” on public school?
Too often, the primary criterion of effectiveness is standardized testing. A school is rated almost exclusively on on how well its students perform on standard testing (usually limited to reading and math) as compared to other students in the same city, district, or state. When the issue of school choice comes up, critics assume that this standard is the only one that matters.
If an experiment in school choice doesn’t show improvement on test scores, it’s often considered empirical proof choice doesn’t work. Yet as economist Tyler Cowen says,