Ultimatum game

The ultimatum game is a way to decide how to share money between two people. It starts with one person (the proposer) who is given some money to split between themselves and another person (the responder). The proposer gets to decide how to split the money, and the responder can either accept the split or reject it. If the responder rejects it, neither person gets any of the money. If the responder accepts it, then the money is split based on what the proposer proposed. The ultimatum game is usually used to show how people behave when they care about fairness and want to make sure that the split is fair.