I like this kind of proposal, where some kind of natural negative feedback loop is created. That said, maybe it depends on why the competitors stock changes. W

I like this kind of proposal, where some kind of natural negative feedback loop is created. That said, maybe it depends on why the competitors stock changes. What if competitors' stocks fall because people believe competitors are doomed now that the merging forces have become so big they will eat everything? Another concern: If an already-concentrated industry sector develops a covert agreement not to ruffle one-another's mergers, which would just exacerbate an existing problem.