If any one of the two markets is in imperfect competition the stoppage point of firm's business will be located at the left of the jumping-off point of the factor reasonable input area ( which is the first production phase); 两个市场中只要有一个为不完全竞争,厂商的停止营业点就会位于要素合理投入区间起点的左方(即生产的第一阶段);