Superfreakonomics_ global cooling, patri - Steven D. Levitt [49]
By the early 1980s, the Prisoner’s Dilemma had inspired a lab game called Ultimatum, which works as follows. Two players, who remain anonymous to each other, have a onetime chance to split a sum of money. Player 1 (let’s call her Annika) is given $20 and is instructed to offer any amount, from $0 to $20, to Player 2 (we’ll call her Zelda). Zelda must decide whether to accept or reject Annika’s offer. If she accepts, they split the money according to Annika’s offer. But if she rejects, they both go home empty-handed. Both players know all these rules coming into the game.
To an economist, the strategy is obvious. Since even a penny is more valuable than nothing, it makes sense for Zelda to accept an offer as low as a penny—and, therefore, it makes sense for Annika to offer just a penny, keeping $19.99 for herself.
But, economists be damned, that’s not how normal people played the game. The Zeldas usually rejected offers below $3. They were apparently so disgusted by a lowball offer that they were willing to pay to express their disgust. Not that lowball offers happened very often. On average, the Annikas offered the Zeldas more than $6. Given how the game works, an offer this large was clearly meant to ward off rejection. But still, an average of $6—almost a third of the total amount—seemed pretty generous.
Does that make it altruism?
Maybe, but probably not. The Ultimatum player making the offer has something to gain—the avoidance of rejection—by giving more generously. As often happens in the real world, seemingly kind behaviors in Ultimatum are inextricably tied in with potentially selfish motivations.
Enter, therefore, a new and ingenious variant of Ultimatum, this one called Dictator. Once again, a small pool of money is divided between two people. But in this case, only one person gets to make a decision. (Thus the name: the “dictator” is the only player who matters.)
The original Dictator experiment went like this. Annika was given $20 and told she could split the money with some anonymous Zelda in one of two ways: (1) right down the middle, with each person getting $10; or (2) with Annika keeping $18 and giving Zelda just $2.
Dictator was brilliant in its simplicity. As a one-shot game between two anonymous parties, it seemed to strip out all the complicating factors of real-world altruism. Generosity could not be rewarded, nor could selfishness be punished, because the second player (the one who wasn’t the dictator) had no recourse to punish the dictator if the dictator acted selfishly. The anonymity, meanwhile, eliminated whatever personal feeling the donor might have for the recipient. The typical American, for instance, is bound to feel different toward the victims of Hurricane Katrina than the victims of a Chinese earthquake or an African drought. She is also likely to feel different about a hurricane victim and an AIDS victim.
So the Dictator game seemed to go straight to the core of our altruistic impulse. How would you play it? Imagine that you’re the dictator, faced with the choice of giving away half of your $20 or giving just $2.
The odds are you would…divide the money evenly. That’s what three of every four participants did in the first Dictator experiments. Amazing!
Dictator and Ultimatum yielded such compelling results that the games soon caught fire in the academic community. They were conducted hundreds of times in myriad versions and settings, by economists as well as psychologists, sociologists, and anthropologists. In a landmark study published in book form as Foundations of Human Sociality, a group of preeminent scholars traveled the world to test altruism in fifteen small-scale societies, including Tanzanian hunter-gatherers, the Ache Indians of Paraguay, and Mongols and Kazakhs in western Mongolia.
As it turns out, it didn