What fact does the "ultimatum bargaining game" demonstrate?

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The ultimatum bargaining game demonstrates that many people would rather not trade than be treated unfairly. In this game, one player (the proposer) is given a sum of money and must propose a division of the money with another player (the responder). If the responder accepts the proposal, the money is divided according to the proposal. If the responder rejects the proposal, neither player receives any money. The game demonstrates that responders will often reject proposals that they perceive as unfair, even though it means receiving no money at all. This suggests that people value fairness and are willing to forego economic gain in order to avoid being treated unfairly.

What Fact Does the "Ultimatum Bargaining Game" Demonstrate