The master gets fat and lazy. Meanwhile, the slave grows stronger and more skilled. It was fear of death that decided the contest. It might seem like the master was able to bear this fear more than the slave, since the slave surrendered in the face of death. The master got off without looking death in the face, since the slave did it first.
Work involves discipline and skill.
As the slave becomes more disciplined and skilled, his or her power balances that of the master. The dialectic has balanced the relations between master and slave. The slave turns into an independent craftsperson and so gains a mind and will of his or her own. Political domination turns into economic cooperation.