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We need to make decisions us throughout our lives. This skill is sometimes necessary even to survive, because our vigilance and behaviour in a crisis situation is the basic mechanism of natural selection. Human behaviour has been the subject of many studies and theories. The expected utility theory, assumes that if a person has a choice of profit x, which is certain and a more favourable option y, but burdened with risk, then he should choose the certain profit. Its usefulness is expected to be higher than the ris...