With This Ring: the International Diamond Trade Part 1: the Debeers Corporation, and With This Ring: the International Diamond Trade Part 2: Conflict - I heard these on NPR the other day, and thought they would make a really cool monopoly/cartel simulation. The series explains who the De Beers "corporation" is and how they managed to turn diamond mining into a monopoly/cartel. This might also be an interesting piece to use in a history class when discussing issues in Africa.