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By Root 543 0

careful. The scene prefigures a game, invented by Werner Guth in the late 1970s and much loved by economists, called the Ultimatum Game, which opens a little window into the human spirit. The first player is given some money and told to divide it with the second player. The second player is told he can accept or refuse the offer, but not change it. If he accepts, he receives the money; if he refuses, neither he nor the first player gets a penny. The question is, how much money should the first player offer the second player? Rationally, he should tender almost nothing, and the second player should accept it, because however small the sum, refusal will only make the second player worse off than acceptance. But in practice, people usually offer close to half the money. Generosity seems to come naturally, or rather, ungenerous behaviour is irrationally foolish, because the second player will – and does – consider a derisory offer worth rejecting, if only to punish the selfishness of the first player.

The lesson of the ultimatum game and hundreds like it is that again and again people emerge from such experiments as nicer than you think. But the even more surprising lesson is that the more people are immersed in the collective brain of the modern commercial world, the more generous they are. As the economist Herb Gintis puts it, ‘societies that use markets extensively develop a culture of co-operation, fairness and respect for the individual’. His evidence comes from a fascinating study in which people in fifteen mostly small-scale tribal societies were enticed to play the Ultimatum Game. Those societies with the least experience of dealing with outsiders were the most hard-hearted, ungenerous and narrowly ‘rational’. Machiguenga slash-and-burn farmers from the Amazon most often offered just 15 per cent of the sum to their co-subjects, and in all but one cases, the second player accepted. Likewise, a Hadza hunter-gatherer from Tanzania usually makes a very small offer and experiences few rejections. On the other hand, players from those societies that are most integrated into modern markets, such as the Orma nomads of Kenya or the Achuar subsistence gardeners of Ecuador, will usually offer half the money just as a Western undergraduate would. The whale-hunting Lamalera of the island of Lembata in Indonesia, who need to coordinate large teams of strangers on hunts, offer on average 58 per cent – as if investing the windfall in acquiring new obligations. Much the same happens in two New Guinea tribes, the Au and Gnau, whose members often make ‘hyper-fair’ offers and yet see them rejected: in such cultures, gifts can be a burden to the receiver because they carry an obligation to reciprocate.

The lesson of this study is that, on the whole, having to deal with strangers teaches you to be polite to them, and that in order for such generosity to emerge, costly punishment of selfishness may be necessary. Rejecting the offer is costly for the second player, but he reckons it is worth it to teach the first player a lesson. The argument is not that exchange teaches people to be kind; it is that exchange teaches people to recognise their enlightened self-interest lies in seeking cooperation. Here, then, lies a clue to the unique human attribute of being able to deal with strangers, to extend the division of labour to include even your enemies.

Cooperation, exchange and specialisation within a family group are routine throughout the animal kingdom: among chimpanzees and dolphins, among wolves and lions, among individuals of almost any social species. A meerkat or a scrub jay trusts its relative on sentry duty to sound the alarm if an eagle appears and shares the duty. A worker ant divides labour with its queen, with soldiers and with its sisters in other castes of worker. All these societies are just large families. Collaboration between unrelated strangers seems to be a uniquely human achievement. In no other species can two individuals that have never before met exchange goods or services to the benefit of each other, as happens routinely