Recent globalism of economic makes the effect of a certain small bankruptcy enhance internationally beyond of the area and country. So, we propose the model in which the interaction between banks and companies is focused and simulate and consider the effect of whether banks invest the funds or not to the growth of companies. In particular, by varying the width of change of the growth rate of companies according to whether they are invested, we researched the difference in the distribution of the final size of companies. The model of banks is based on actual data such as financial statement analysis edited by Japanese Bankers Association. As the results, the investment of banks did not raise the mean of growth rate but widened the disparity in size among companies. As future plans, we'd like to reproduce and analyze the cause of large chain bankruptcy using the extended model.
