Wasn't that how Rockefeller killed off small local competitors? First sell at prices cheaper than it costs to buy new stock so that small businesses went broke, and abuse the fact that you're big enough to last longer then they do. Then when there is no competition, rise prices again.

I dunno, I was told this once a long time ago and I don't know anything about Rockefeller. I see no flaws with the tactic though (aside from the ethical ones).