As in the real world, children perform "jobs" and are either paid for their work (as a fireman, doctor, police officer, journalist, beautician, etc.) or pay to shop or to be entertained.
The indoor edutainment centre is a city built to scale for children, complete with buildings, paved streets, vehicles, a functioning economy, and recognizable destinations in the form of "establishments" sponsored and branded by leading multi-national and local brands.