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Mina Mahmoudi, a lecturer in the Department of Economics at Rensselaer Polytechnic Institute, has developed a new theory of economic decision-making that explains why humans, in general, choose judgments that are sufficient rather than ideal.
The research has been published in the journal, "Review of Behavioral Economics." Dr Mahmoudi theorized an aspect of relative thinking explaining people may use ratios in their decision-making when they should only use absolute differences. The inverse is also possible.
To explain this behavioural anomaly, Dr Mahmoudi has developed a ratio-difference theory that gives weight to both ratio and difference comparisons. This theory seeks to more accurately capture the manner by which a boundedly rational decision-maker might operationally distinguish whether one alternative is better than another.
"Effectively solving some economic problems requires one to think in terms of differences while others require one to think in terms of ratios," Dr Mahmoudi said. "Because both types of thinking are necessary, it is reasonable to think people develop and apply both types. However, it is also reasonable to expect that people misapply the two types of thinking, especially when less experienced with the context."
Past studies have shown that when given the opportunity to save, for example, $5 on a $25 item or a $500 item, people, in general, would put in more effort to save the money on the lower-cost product than the more expensive item. They believe they are getting a better deal because the ratio of cost to savings is higher. In fact, the $5 saved is the same for both items and the perfect, or optimal choice, would be to look at the absolute savings and work equally hard to save each $5. People should use differences to solve this problem, but many seem to make unreasonable decisions because they apply ratio thinking.
"Understanding how the cognitive and motivational characteristics of human beings and the operating procedures of organizations influence the working of economic systems is of critical importance," Dr Mahmoudi said. "Many economic behaviours such as imitation occur and many economic institutions like inventories exist because people cannot maximize or because markets are not in equilibrium. Our model provides an example of a behaviour that occurs because people cannot maximize."
This model can be applied to a variety of behavioural economic experiments in the gambling industry and financial markets among others. 

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