STRANGER: There were two sorts of acquisitive art; the one concerned with hunting, the other with exchange.
THEAETETUS: There were.
STRANGER: And of the art of exchange there are two divisions, the one of giving, and the other of selling.
THEAETETUS: Let us assume that.
STRANGER: Next, we will suppose the art of selling to be divided into two parts.
THEAETETUS: How?
STRANGER: There is one part which is distinguished as the sale of a man's own productions; another, which is the exchange of the works of others.
THEAETETUS: Certainly.
STRANGER: And is not that part of exchange which takes place in the city, being about half of the whole, termed retailing?
THEAETETUS: Yes.