PowerPoint for a class to play a world trading game role playing a country. I use this in tandem with a timer and if they don't trade before the time is up teacher can make a trade for them.
Based loosely on a National Geographic game, modified for the Australian National Curriculum Stage 5 Geography: Human Wellbeing (Influence of Natural Resources, variations in natural resources and the impact on human wellbeing).
Also relevant to Economics, Business Studies, Commerce.
Can be modified. Happy trading!