NO.PZ2016010802000073
问题如下：
Collusion is less likely in a market when:
选项：
A. the product is homogeneous.
B. companies have similar market shares.
C. the cost structures of companies are similar.
解释：
B is correct.
When companies have similar market shares, competitive forces tend to outweigh the benefits of collusion.
考点：合谋
解析：如果市场上大家份额差不多，那么大家就都有机会做老大，就容易心怀鬼胎，合谋就不容易产生。
如果有一个厂商份额比较多，反倒容易组织大家形成合谋。所以B选项入选。
当长生门生产产品同质化严重，并且成本相似的时候，合谋也容易形成，所以A,C不入选。
成本结构相似和成本相似是两个概念吧？