Each co op gets their own barter barn. It comes empty. The co op members fill it up with extra items they've produced. When a member needs something they don't have they can go to the barter barn & trade items they do have for what they need. Example :
To get 5 sugar cubes you have to trade 2 syrup jugs.
5 syrup jugs you trade 2 caramel jugs.
So on & so forth.
You can only go in ONCE every 60 minutes.