Socrates moves to define his "Ideal Polis". By describing a polis in which justice must play a major part. His goal is to prove that justice comes out on top.
The Structure of the City in Speech
Only a small number of citizens are needed.
They live a satisfying but simple life, sharing their labour and their produce. Men get together for mutual support; each person can only do one thing well. There are three types of jobs: producers, traders and carriers, and laborers.
The three most important human necessities are established, in order of importance: food, shelter, and clothing.
A City Fit for Pigs!
Glaucon describes Socrates' city as a city fit for pigs. He cites how Socrates said that the fun his ideal citizens would have is sitting around the fire roasting acorns. Glaucon calls for a modern city with a bit of comfort and luxury.