In characterising the Japanese way of business, Professor Okumura has made one of the most significant contributions to the study of economics. Following his study of the conversion of prewar zaibatsu to postwar groups of enterprises, he worked on the roll of comprehensive trading companies in these groups, the main banking system and the permanent employment system. However, he is very critical of this way of business, whereas those influenced by him are enthusiastic in its appreciation. This is the first English translation of his work.