If anyone wants an accessible summary, this is good: http://hspm.sph.sc.edu/courses/econ/Classes/Arrow.html http://hspm.sph.sc.edu/courses/econ/Classes/Arrow.h

If anyone wants an accessible summary, this is good: http://hspm.sph.sc.edu/courses/econ/Classes/Arrow.html http://hspm.sph.sc.edu/courses/econ/Classes/Arrow.html This is the key paragraph: " The basic problem is that, unless you know as much about medicine as your doctor, you can't evaluate the quality of advice he or she (mostly "he" in 1963) gives you. "