Someone buying a car generally knows what combination of cost, comfort, safety, carrying capacity, reliability, and fun he wants. Many different manufacturers each market a variety of models. A buyer can try before buying and consult one of many rating services. Manufacturers consistently producing a bad product know they can lose money quickly.
Shareholders hate revenue declines.
They give managers wide latitude in selecting and deploying employees. Consumers of public school services often have only the vaguest idea of the combination of academic knowledge, physical education, vocational subjects, social engineering, and fun that they want for their children. Model selection is a bad joke. Before charter schools, public education offered two models. Other than the Independence Institute's Parent Information Center, school rating systems hardly exist.