A barbeque skewer, or other long sharp object. A stop-watch and a dinner bell or whistle. Make a sign for each region large enough that it can be read from across the room. Blow up 3 'Food' balloons and 3 'Waste' balloons per participant and tie them individually with string. When using the Helium version appoint an adult to be the 'Keeper of the Air' and manage the helium tank.
Divide participants up into regional groups according to the percentage of the world's population.
Give each region a bag of balloons, a marker, and a ball of string. Give each participant a garbage bag. In order to live, you will need to use some of your resources - to build houses, make food, and all the other things you need and want. If you want to become rich quickly you will have to transform your resources into products as fast a possible. Stuff your inflated balloons into your garbage bags.