Ryuko has become a word completely premised on the economy today &sbquo and its definition in the realm of economics is taken for granted. A state in which consumption controls production socially in the relationship of production and consumption is called ryuko. Ryuko has been spoken of economically in a theory of chance that drives social and cultural motivation that takes the balance of relationship between production and consumption as chance. This&sbquo however&sbquo cannot be called modology (ryukogaku = study of how things sp) It is only a concept that has been shoved inside a theory of a chance-like relationship between production and consumption in a broad sense in capitalism. Orginally&sbquo the study of how epidemics such as the plague that threaten the survival of mankind spreads is also ryukogaku. This has been rhetoricalized to explain a certain expansive nature or a state in which something proliferates in the economy&sbquo particularly&sbquo particularly in capitalism&sbquo Therefore&sbquo in economics&sbquo ryukoron (theory of fashion) may exist&sbquo but ryukogaku dose not. Design under a capitalist economy ha always been positioned in parallel to ryuko. There is no doubt that design has been driven into a profession that incites motivation in the dichotomy between such elements as chaos and order&sbquo stagnation and advancement&sbquo and homogeneity and heterogeneity in life due to fashion phenomena. I'd like to point out that it is time that design be repositioned as the true foundation of ryukogaku as in the medical fields of statistics and epidemic physiology.