Property that you can use to produce value beyond itself through workers' labor is capital.
Suppose you had a robot. Would that robot be labor or capital? Assume the robot has the same capability for work as you.
At the end of the day it is a machine, so "capital". Likewise you own your body, it is your capital.
Suppose you had a robot. Would that robot be labor or capital? Assume the robot has the same capability for work as you.
At the end of the day it is a machine, so "capital". Likewise you own your body, it is your capital.