打个比方：原来JJ中问raw material是怎么样的，JJ答案是market share小的和那些market share大的差不多，在附件4 Exp result中我们可以看到：In the market for raw or semi-finished materials are very small business units with less than 5 percent market shares about equally successful as business with about 10 pervent market share. 答案呼之欲出。
原帖链接：http://forum.chasedream.com/GMAT_Math/thread-482573-1-2.html作者: billyisfragile! 时间: 2018-10-9 19:28 Abstract
The paper analyzes the functional relationship between profitability and market share for type of businesses in the PIMS data base. Although a linear relationship has been imposed in other studies, our result shows that empirically it seems a poor representation of the data. In addition, three observations seem to be most evident. First, small‐share businesses were not per se less successful than larger business units. In the service market and the market for raw or semi‐finished materials small‐share businesses were just as profitable or even more profitable than larger business units. Second, some businesses were ‘stuck in the middle’, which was most evident in the service market but also in the retail and wholesale markets. Third, very large‐share businesses were often less profitable. A critical market share was identified as between 65 and 70 percent. Beyond that level the ROI decreased.