Plato's Republic 3ii

  And now let us see how our city
  will be able to supply this great demand:
  We may suppose that one man is a husbandman, another a builder,
  some one else a weaver --shall we add to them a shoemaker,
  or perhaps some other purveyor to our bodily wants?.
  The barest notion of a State must include four or five men.Clearly.

edit: formatting

http://classics.mit.edu/Plato/republic.3.ii.html