抄録
An economic system is an environment for living individual man and a condition of life. The uncertainty in the future increases when the economic system that is the environment for individual man changes. The role of fluctuations is very important for understanding the economic system as a complex system and its layered structure. It is important that fluctuations bring evolution to the economic system. The notions of fluctuations and cooperated adaptive actions of micro agents are key notions for micro-macro layered structure of the economic system. An economic system consists of the macro system and the micro system. This is the most basic layered structure of an economic system. It is important for understanding an economic system as a complex system to understand this hierarchy as a result of evolution from micro to macro. The fluctuations of the macro system bring instability and the uncertainty to micro agents. Therefore, micro agents take cooperated adaptive actions. And, these cooperated adaptive actions bring the change to the macro system. This is indeed the policy process as a whole.
