Who is Master from The Theory of the Leisure Class and what is their importance?

The master is the slave owner. He is a member of the leisure class and the slaves represent his level of wealth and therefore his social standing within the community. The behavior of the slave is also a reflection on him. There is a prescribed code of conduct for both master and slave. If the slaves don't exhibit the proper behavior, then others think that he is too poor to obtain well-behaved slaves.