Consider an ultimatum game where the Proposer offers a proportion of $100 to the Responder, who can either accept or reject the offer. If the Responder accepts, both the Proposer and the Responder keep the agreed share, while if the Responder rejects, then both receive nothing. The figure below shows the results of a study that compares the responses of US university students and Kenyan farmers.

100 Fraction of Responders who would Farmers (Kenya) Students, Emory University (US) 75 accept the offer (%) 50 25 0 10 20 30 40 50 Fraction of the pie offered by the Proposer to the Responder (%)