In a break between two parts of a lecture, each half of the students is offered snacks, but they are informed that the snacks must go around for the other half of the students in the next break as well. The students are asked to design a concept of how to assure some sort of fair division.
This game | simulation | real-life experiment shows how difficult it is to assure that a group makes only fair use of resources that are available. The attached file
Sharing resources with future generations
describes the setting in more detail and makes some suggestions for the discussion of the exercise.