When I was in fifth grade, my school had what we called "Business Days." This was essentially a couple of days near the end of the year when all the fifth graders split off into groups and had to run their own "business." A variety of services and products were offered - hair salons, palm reading, video game playing, toys, beanie babies, candy you get the idea. Everyone got a budget of paper money that was good at any business.
Each class - there were I think three or four fifth grade classes total - was its own "town" and the teacher was the "Mayor." Due to a combination of not getting all my work done in time and not managing to get a