The ultimatum game models social exchange in situations in which the rational motive to maximize gains conflicts with fairness considerations. Using two independent behavioral measurements, the authors tested two contradicting predictions: that the preference for fairness is a deliberative...

In the Ultimatum Game (UG) one player, named “proposer”, has to decide how to allocate a certain amount of money between herself and a “responder”. If the offer is greater than or equal to the responder’s minimum acceptable offer (MAO), then the money is split as proposed, otherwise,...