In his contribution to a recent symposium on school choice David Hargr
eaves makes two philosophical mistakes concerning the design of educat
ional policy. The first is that libertarianism-the presumption that ch
oice and diversity are desirable in social institutions-implies the pr
esumption that choice is desirable in the design of educational instit
utions. I argue that libertarianism actually implies a. mild presumpti
on against choice in education. The second is that the common good is
a significant factor to be weighed when thinking about how to design e
ducational institutions. I argue that because educational institutions
must mediate quite strict obligations that all adults have to each in
dividual child as a matter of justice, the common good must be at most
a secondary consideration, of significance only when deciding between
sets of institutions which do equally well at delivering our obligati
ons.