NO.PZ2016010802000069
问题如下：
Aquarius, Inc. is the dominant company and the price leader in its market. One of the other companies in the market attempts to gain market share by undercutting the price set by Aquarius. The market share of Aquarius will most likely:
选项：
A.increase.
B.decrease.
C.stay the same.
解释：
A is correct.
As prices decrease, smaller companies will leave the market rather than sell below cost. The market share of Aquarius, the price leader, will increase.
考点：领导厂商模型
解析：在领导厂商中，如果小厂商降价，那么市场中的领导厂商也会同时采取进一步降价的反制措施。
这种情况下，由于领导厂商具有更大的生产规模以及更小的生产成本，所以它能承受更低的价格冲击，那么小厂商通常就会失去原有的市场份额或是破产倒闭。
那个题说的是在长期来看oligoply在dormant market的份额会不断减少，所以我选的是decrease
