Jerusalem, January 11, 2010 Why do some people like to take risks by playing "longshot" payoffs while, on the other hand, taking the opposite tack by buying insurance to reduce risks? A team of economists and molecular geneticists from the Hebrew University of Jerusalem and two Asian universities say the answer can be found in our genetic makeup.
The team set out to tackle the long-standing question in economic theory as to why people tend to be risk-preferring when facing longshot risks involving significant gains, such as betting on race horses, and on the other hand are risk averse when facing significant losses -- buying home or car insurance, for instance.
Many economists have struggled with this paradox, says Richard Ebstein, the Sylvia Scheinfeld Professor of Human Genetics at the Hebrew University of Jerusalem, who has probed this subject along with economists Prof. Soo Hong Chew of the National University of Singapore (NUS) and Dr. Songfa Zhong of NUS and the Hong Kong University of Science and Technology.
Ebstein notes the psychological explanation suggested by former Hebrew University psychology Professors Daniel Kahneman (a Nobel Prize laureate) and Amos Tversky, as embodied in their widely accepted prospect theory, to explain why people play the lottery and at the same time purchase insurance. Although prospect theory offers a psychological explanation for this facet of economic behavior, the underlying neurobiological and neurogenetic mechanisms have remained obscure until now, said Ebstein.
In an article just published online on PLoS ONE, Ebstein and his colleagues combined the tools of experimental economics and molecular genetics to examine the role of a well-characterized gene, monoamine oxidase A (MAOA), in predicting whether subjects are more likely to buy the lottery or insurance (or both) under well-controlled laboratory conditions.
In the experiment, 350 Han Chinese subjects were
|Contact: Jerry Barach|
The Hebrew University of Jerusalem