By definition, children are pupils. The demand for the milieu of childhood creates an unlimited market for accredited teachers. School is an institution built on the axiom that learning is the result of teaching. And institutional wisdom continues to accept this axiom, despite overwhelming evidence to the contrary. We have all learned most of what we know outside school.
Pupils do most of their learning without, and often despite, their teachers.
Most tragically, the majority of men are taught their lesson by schools, even though they never go to school. Everyone learns how to live outside school. Even children who are under a teacher's care day and night are no exception to the rule. Teachers have made a poor showing in their attempts at increasing learning among the poor. Poor parents who want their children to go to school are less concerned about what they will learn than about the certificate and money they will earn.