A group of psychologists from the United States figured out how the stress factors and emotional stress influence the spending of the person. Volunteers who agreed to the experiment, were divided into two groups. Each person received a $ 250 purchase. Subjects from the first group were allowed to spend the money on their own, the second group is put into the rigid framework, allowing to buy in the shops only for necessities.
Volunteers from the first group were much more wasteful. While in the strict limits, people tried to save money and to distribute them rationally. Most people from the second group was afraid to spend too much.
Scientists suggest it's all in the level change of cortisol, a stress hormone. This compound makes a person to save money.