EN
Theorems about the rational decision making play very important role in the decision theory. According to these theorems people make their decisions by using the rule about maximum benefits. However in the literature we can find conclusions from research and experiments which indicate that when people are making decisions, they are very often breaking that rule about maximum profits. According to that research a few paradoxes of rationality were formulated. In this article experiments concerning the Allais paradoxes are analyzed. The incompatibility between paradox and the expected utility theory were discussed. Also the certainty effect and the common consequence effect were analyzed.