 To illustrate, suppose that a society uses markets to coordinate the education of citizens (see Friedman 1962). A system of for-profit schools would operate as firms, hiring teachers, buying computers, and selling education services to the public. Parents, in turn, would act as consumers, buying the best education for their children at the lowest cost. Each citizen in this arrangement would reason from the standpoint of her own private concerns: as school managers, citizens would aim to maximize profits, and as parents, citizens would aim to get the best education for their children at the lowest cost. No one would act out of a concern for the education system as a shared facility that serves common interests. In fact, the market may require citizens to avoid this perspective. After all, to lower costs effectively, school managers must not show too much concern for the education of their students. And in order to improve the education of their own children, parents must not show too much concern for the education of other people’s children.