A man is a key subject of economics and economic theory. “A man is irrational” - this opinion can be made from Allais paradox, risk aversion and other well-known fundamental problems. For a long time, this opinion was a barrier to proper solution of these problems and the development of the economic theory. A radically new approach has been proposed. It considers arrangement infringement possibility as a quite different source of such problems. It opens a quite different way to solve them and remove this barrier. It helps economists to open new and rediscover old fields and trends for the research.