That would only apply if teachers produced investment bankers. Teachers produce the foundation, the student the building.
If a person learns how to produce a widget with fewer resources, then that person has left over resources with which to produce other widgets. The more widgets, the more value produced by that person. If a burger flipper busts his butt to flip 20% more burgers than his peers he hasn't accomplished much. But, if he gets an education that affords him the ability to create a robot that replaces all his peers for a fraction of the cost he's truly produced something more valuable than his present station; he will realize the increase. It is perfectly logical.
Of course bootstrapping exists. Who said anything about an individual climbing the ladder all by themselves? I apply myself so that my children can start from a higher position. That is the noble goal of all good parents. My father was a timber faller, my mother a homemaker. I took the position they gave me on the ladder and ran with it. Today I am the chief engineer of a medical software company. Children can squander the opportunity given, absolutely. But their progeny will suffer a loss of station.
The Wright Bothers weren't the first to fly. They were just the first not to crash.