From Scientific American:

The Ultimatum Game and Non-Human Primates
Sarah Brosnan
Georgia State University

Since its invention 25 years ago, the “Ultimatum Game” has become a workhorse of behavioral economics. The game (abbreviated UG) is designed to examine peoples’ decisions about resource allocation in a very simple bargaining situation. The first person, labeled the proposer, receives a sum of money to divide between herself and a partner (typically anonymous). The second person, or responder, can either accept the division, in which case both will be rewarded as the proposer indicated, or refuse the division, in which case neither player receives any money.

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