Dominant Dozen

A transiently popular term for the 12 most common conditions associated with AIDS: Pneumocystis carinii pneumonia, Kaposi sarcoma, Toxoplasma encephalitis, upper GI candidiasis, lymphoma, Mycobacterium avium complex, CMV, cryptosporidiosis & microsporidiosis, cryptococcosis, HSV1 and -2 infections
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Let's turn the argument on its head: It's because they can't control their fragmenting markets that the Dominant Dozen are frantically trying to acquire and merge.
The trouble with concepts such as the Dominant Dozen is that the companies mentioned are neither dominant nor are there just 12 of them.