An interesting read for background on this is from the economist this may examining the state of competition in the US.<p><a href="http://www.economist.com/news/briefing/21695385-profits-are-too-high-america-needs-giant-dose-competition-too-much-good-thing" rel="nofollow">http://www.economist.com/news/briefing/21695385-profits-are-...</a>