Are Monkeys More Rational Than Humans?

See The Hard Science of Monkey Business by AMY DOCKSER MARCUS of The Wall Street Journal. It is about the research that Yale professor Laurie Santos and the economic experiments she does with primates (Capuchin monkeys). Excerpts:

"The primate lab is home to 10 "shockingly smart" brown Capuchin monkeys trained to trade tokens for food. It was a short leap for Dr. Santos and her team to decide to study how monkeys make decisions about money."

"In one experiment, they gave each monkey a wallet filled with 12 flat aluminum tokens, monkey money that the animals could trade for food. Right away, the scientists saw the similarities to human behavior. When researchers slashed the price on certain foods, the monkeys sought out the best deal. They also typically spent all their cash at once and didn't bother to save.

Then researchers decided to test a more complex economic theory which shows that people do not judge price in a vacuum. Sitting with the team at the coffee shop, Dr. Santos could see how the concept worked in her own life. Many days, she feels guilty about spending $2.20 on a cup of coffee. But when she looks up at the chalk board listing drink prices, the Nutella Latte goes for $3.85 and the Ginger Snap is $4.15. "My $2 cup doesn't seem as expensive anymore," she said.

Monkeys make similar assessments. In one experiment, a researcher showed a monkey two pieces of apple but handed over one in exchange for a token. A second researcher showed one piece of apple and gave the slice to the monkey for the token. The monkeys strongly preferred to trade with the second researcher. They did not like being offered two apple pieces and then only getting one."

"Researchers wondered whether monkeys, like humans, desire an expensive item more. For the same number of tokens, the monkeys could choose whether they got a tiny square of blue Jell-O or a big chunk of red Jell-O. Later, the monkeys were allowed to choose which kind they wanted. If the monkeys were like humans, they would have gone for the blue Jell-O, the more "expensive" choice. But the monkeys gorged happily on both.

The researchers are still gathering and analyzing the data. One possibility: Human taste preferences are based on many factors, whereas the monkeys' are not. Some might argue that human economic behavior is more advanced since it includes "culture and meta-awareness" in decision-making, said Dr. Santos. There's another, less flattering possibility too. "The monkeys," she said, "are more rational.""

See also Chimpanzees are rational maximizers in an ultimatum game by Keith Jensen, Josep Call & Michael Tomasello of The Max Planck Institute for Evolutionary Anthropology.

"Abstract

Traditional models of economic decision-making assume that people are self-interested rational maximizers. Empirical research has demonstrated, however, that people will take into account the interests of others and are sensitive to norms of cooperation and fairness. In one of the most robust tests of this finding, the ultimatum game, individuals will reject a proposed division of a monetary windfall, at a cost to themselves, if they perceive it as unfair. Here we show that in an ultimatum game, humans' closest living relatives, chimpanzees (Pan troglodytes), are rational maximizers and are not sensitive to fairness. These results support the hypothesis that other-regarding preferences and aversion to inequitable outcomes, which play key roles in human social organization, distinguish us from our closest living relatives."

Related posts:

Monkeys seem to be selfish and rational (Monkeys in Bali know the most valuable items to steal from tourists to get them to trade food to get the items back)

Are Chimps More Rational Than Humans? 

It reminds me of research that was done at Texas A & M some years ago. They found that rats and pigeons act rationally. If they had to press a lever so many times to get a drop something to drink or a pellet of food, they "bought" less of either one if the scientists raised the number lever pushes it took to get one. This was like raising the price. More lever pushes to get either food or drink, the less they tried to get of it. So they followed the law of demand. This was reported in Steven Landsburg's book The Armchair Economist.