An excellent presentation from Richard Vedder:
FEDERAL STUDENT financial assistance programs are costly, inefficient, byzantine, and fail to serve their desired objectives. In a word, they are dysfunctional, among the worst of many bad federal programs.
These programs are commonly rationalized on three grounds: on the grounds that assuring more young people a higher education has positive spillover effects for the country; on the grounds that higher education promotes equal economic opportunity (or, as the politicians say, that it is “a ticket to achieving the American Dream”); or on the grounds that too few students would go to college in the absence of federal loan programs, since private markets for loans to college students are defective.
All three of these arguments are dubious at best. The alleged positive spillover effects of sending more and more Americans to college are very difficult to measure. And as the late Milton Friedman suggested to me shortly before his death, they may be more than offset by negative spillover effects. Consider, for instance, the relationship between spending by state governments on higher education and their rate of economic growth. Controlling for other factors important in growth determination, the relationship between education spending and economic growth is negative or, at best, non-existent.