 A typical public goods game set-up is as follows. A number n of university students is brought into a room and seated at a table. They each receive an endowment of, say, €x. They are then asked to decide how much of that to spend on a group project, where contributions can range from €0 to the entire endowment. They put their contributions into an envelope so that other participants cannot see how much each individual has contributed. The sum total of the contributions is then doubled by the experimenter and divided equally among the participants.