Thirst for Fairness May Have Helped Us Survive

http://www.nytimes.com/2011/07/05/science/05angier.html?_r=1&smid=fb-nytimes&WT.mc_id=SC-SM-E-FB-SM-LIN-TTE-070511-NYT-NA&WT.mc_ev=click

By NATALIE ANGIER
Published: July 4, 2011

Among the Ache hunter-gatherers in eastern Paraguay, healthy adults with no dependent offspring are expected to donate as much as 70 to 90 percent of the food they forage to the needier members of the group. And as those strapping suppliers themselves fall ill, give birth or grow old, they know they can count on the tribe to provide.

Among the !Kung bushmen of the Kalahari in Africa, a successful hunter who may be inclined to swagger is kept in check by his compatriots through a ritualized game called “insulting the meat.” You asked us out here to help you carry that pitiful carcass? What is it, some kind of rabbit?

Among the Hadza foragers of northern Tanzania, people confronted by a stingy food sharer do not simply accept what’s offered. They hold out their hand, according to Frank Marlowe, an anthropologist at Durham University in England, “encouraging the giver to keep giving until the giver finally draws the line.”

Among America’s top executives today, according to a study commissioned by The New York Times, the average annual salary is about $10 million and rising some 12 percent a year. At the same time, the rest of the tribe of the United States of America struggles with miserably high unemployment, stagnant wages and the worst economic crisis since the Great Depression. Now, maybe the wealth gap is a temporary problem, and shiny new quarters will soon rain down on us all. But if you’re feeling tetchy and surly about the lavished haves when you have not a job, if you’re tempted to go out and insult a piece of corporate meat, researchers who study the nature and evolution of human social organization say they are hardly surprised.

Darwinian-minded analysts argue that Homo sapiens have an innate distaste for hierarchical extremes, the legacy of our long nomadic prehistory as tightly knit bands living by veldt-ready team-building rules: the belief in fairness and reciprocity, a capacity for empathy and impulse control, and a willingness to work cooperatively in ways that even our smartest primate kin cannot match. As Michael Tomasello of the Max Planck Institute for Evolutionary Anthropology has pointed out, you will never see two chimpanzees carrying a log together. The advent of agriculture and settled life may have thrown a few feudal monkeys and monarchs into the mix, but evolutionary theorists say our basic egalitarian leanings remain.

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In follow-up research with older children and adolescents that has yet to be published, Dr. Fehr and his colleagues have found a more nuanced understanding of fairness, an acknowledgment that some degree of inequality can make sense: The kid who studies every night deserves a better grade than the slacker. Nevertheless, said Dr. Fehr, there are limits to teenage tolerance. “ ‘One for me, two for you’ may not be too bad,” Dr. Fehr said. “But ‘one for me, five for you’ would not be accepted.”

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Our ancestors had to learn to trust their neighbors, and the seeds of our mutuality can be seen in our simplest gestures, like the willingness to point out a hidden object to another, as even toddlers will do. Early humans also needed ways to control would-be bullies, and our exceptional pitching skills — which researchers speculate originally arose to help us ward off predators — probably helped. “We can throw much better than any other primate,” Dr. Wilson said, “and once we could throw things at a distance, all of a sudden the alpha male is vulnerable to being dispatched with stones. Stoning might have been one of our first adaptations.”

Low hierarchy does not mean no hierarchy. Through ethnographic and cross-cultural studies, researchers have concluded that the basic template for human social groups is moderately but not unerringly egalitarian. They have found gradients of wealth and power among even the most nomadic groups, but such gradients tend to be mild. In a recent analysis of five hunter-gatherer populations, Eric Aiden Smith of the University of Washington and his colleagues found the average degree of income equality to be roughly half that seen in the United States, and close to the wealth distribution of Denmark.

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