In an ideal world, as traders who will offer you a commercial page to rank for keywords. Unfortunately, people are more likely to link to pages of information, it is an error and in some cases the page in May to compete with commercial and higher offer from you.
There are several methods that you can use to avoid this, include:
Many Linkbait
This strategy revolves around building a lot of authority that offer commercial page is still ranked despite nobody else links to them ... mainly based on the ranking of the domain authority and internal anchor text.
Change URL
Several months after you start a relationship that both effective piece to consider changing the content page. You can choose several options:

• Add aggressively placed ads on the page, make sure that the flow of traffic have the opportunity to see the commercial offer.
• Add a link to another page on your site to help the flow of PageRank to the other main pages.
• Create a well-linked article in the sub-part and part of the good that is connected to a URL to a salesletter.

Internal reset
of course there will be a number of pages that, compete for the same keywords.
If the link from another site to consider the consolidation of authority by the link 303 back to the less important pages that are more important related pages.
For example, if you are ranked # 8 and # 13 you may be able to rank # 3 or # 5 with link combine juice from their pages.
Please try to make profit and good luck