Eliciting parameters of cumulative prospect theory in an Iranian sample

Among decision theories under risk and uncertainty, cumulative prospect theory has become very popular, which is evident in its more than 50,000 citations. In applied studies or for scenario making and explaining many phenomena many researchers use the initial parameters estimated by Kahnemann and Torsky (1979). Given the impact of environment and culture on risky behavior and parameters of prospect theory, the present paper elicits the utility and probability weighting functions in both gain and loss domains and estimates parameters of their functional forms. By estimating all parameters of cumulative prospect theory, this paper tries to provide an integrated picture of people's attitude towards risk from an Iranian sample. In addition, the superiority of this theory over expected utility is indirectly tested. Findings confirm many predictions of cumulative prospect theory such as the fourfold pattern of risk attitude and concavity of value function over gains and its convexity over losses. The findings of this experiment show the superiority of cumulative prospect theory over expected utility theory. The findings show that people's perceptions of probabilities are not linear and their degree of risk aversion depends on probabilities. More specifically, most subjects behaved according to the pattern of reducing risk aversion by increasing the probability of loss and increasing risk aversion by increasing the probability of gain. These findings are consistent with the fourfold pattern of risk attitude and indicate that the behavior of the sample is not different from previous samples.