抄録
This study analyzes the impact of the “productive circulation costs” on agricultural corporations, using both a theoretical consideration and case studies. Through theoretical analysis, the research clarified that “productive circulation costs” have a value-generating effect for the individual capitalists, from which they may obtain extra surplus-value (surplus profit). In order to achieve this aim, the importance of innovative machinery taken as the instruments of labour and cooperation based on a division of labour taken as a labour-power as starting-points must be acknowledged. Through the case studies, the following two points were clarified. First, in the case of vegetable production, the shipping and marketing process is generally more labor-intensive than the production process, with such “productive circulation costs” accounting for a high percentage of total expenses. Second, we proved that in order to obtain extra surplus-value (surplus profit) from this “productive circulation costs”, some corporations have invested capital in machinery, while others have mainly employed skilled labour．
