So they then miss some obvious factors
That doesn't contradict the importance of the factors that they then found.
Market power etc allows them to leverage an initial advantage. It doesn't eliminate the need to establish and maintain that initial advantage.
Cheers,
Ben
"Career politicians are inherently untrustworthy; if it spends its life buzzing around the outhouse, it\ufffds probably a fly."
- [link|http://www.nationalinterest.org/issues/58/Mead.html|Walter Mead]