Babysitting Exchange

Babysitters are so expensive. And you have no idea who the agency will send.
So, we started a neighborhood babysitter exchange. It’s the neighborhood, so you know who your children are with.
How does it work? Well, everybody gets a number of credits, and people exchange them for babysitting services.
When you run out of credits, you babysit to earn more.
We started with popsicle sticks to represent the credits, but people started to buy those at arts and crafts stores, and hyperinflation kicked in.
It broke down with people faking babysitting jobs, using dolls or watermelons dressed in diapers.