Abstract
It has been reported in preceding papers that a maximum profit could be obtained for an industrial corporation when the value of (lowest) unit price of selling products, b coincides with the value of bm, a theoretically designed index. Effects of fluctuating markets on the index, bm, were analyzed in terms of the JSR-RDM Model previously proposed, and it was found that the variation in market size, either of expansion or shrink, increases the value of bm and that the wider the fluctuation, the larger the increment of bm becomes. It was found also that this type of increase in bm becomes to be more enhanced for larger scaled and less automated factories. Effective managerial countermeasures were given to restore bm to its original position. Corrections found to be necessary for Parts 7 and 8 of series of papers were given in the Appendix.
