We are having a lot of fun in school with our economics unit, Let's Trade. One of the things we did was have a paperclip economy. It was where we had paperclips for money, and we had to buy different squares of paper in different colors to complete our shopping list.
There were four stores, and each one sold the paper squares for different prices. We had to spend our paperclips to fill out or order, but some stores ran out of supplies which made it challenging!