City

In 3rd grade they do something called City.  You can either make "goods" to sell or charge to play a game.  You also have a opportunity to be a buyer.

Bess and dad came up with the idea of making flubber.  Bess's Fantastic Flubber.

This is something Bess loves (mom, not so much).  She came home with only a few to spare and was very happy with her earnings (fake money).