| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely specify a "bargain sale hunter". <P>SOLUTION: An average profit rate being the rate of cumulative profits to the cumulative procurement sum of money for each customer is calculated, and customers are classified in the order of the magnitude of the average profit rates (step S22). <P>COPYRIGHT: (C)2005,JPO&NCIPI |
