Overproduction is relative to the system under consideration. If you set up a system in a certain way, almost all labor can be overproduced. To take an extreme

Overproduction is relative to the system under consideration. If you set up a system in a certain way, almost all labor can be overproduced. To take an extreme rhetorical example: if slavery is allowed, human capitol becomes ridiculously cheap and you can say labor is overproduced.