Abstract for: Fifty years system dynamics of Japanese economy

The story of Japanese economy 1970-2010 is told with modeling and simulation of the decision process of capital investment in Japan. Using the model that can reproduce GDP statistics perfectly, a prediction from 2011 to 2020 is displayed. Then to revise the model two exogenous variables are converted into endogenous ones. Conversion of such variables as capital to production ratio and additional demand is successful. Simulation runs of the revised model provide certain informations for policy improvement in Japanese national economic profitability.