Google isn't actively blocking other advertising companies from competing; they're just the winner in a winner-take-all market. Similarly, Google dominates int

Google isn't actively blocking other advertising companies from competing; they're just the winner in a winner-take-all market. Similarly, Google dominates internet search but doesn't block other companies from offering competing products. Interestingly, a Google search for 'search engine' does not return Google itself in the top ten results: http://www.google.ca/search?q=search+engine http://www.google.ca/search?q=search+engine