Abstract
Thanks to a development of modern technology, We have been able to live a comfortable life. As the result of the pursuit of technology, however, environmental destruction and other many problems have been brought about. The causes of environmental destruction have been carried by various levels: from the level of individuals to that of nations. It is quite obvious that business should cause one of big major environmental problems. I expect that business ethics gives us a key to solve the problems. This time, I want to bring out a question:is it possible that business ethics changes many problems caused by business in a modern society? In order to find a solution of the problems in a modern society with the help of the medieval ages, I would like to reflect the 20th century. The reason why I picked up the medieval ages is the existence of a famous book on history written by Johan Huizinga. The title is The Waning of the Middle Ages,("Herfsttij der middeleeuwen")
