Here's what's going on there: Google figures, from your query, that your intent is probably shopping. And those are the top 4 results from the shopping corpus. If you click on the "Shopping results for..." link, you can see the full shopping corpus.
I don't really know how the product corpus works, but AFAIK Google is not being paid anything for those results. They're compiled from a bunch of commercial sites across the web. Google gets paid when you click on the ads, which are clearly marked at the top and right hand column.
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http://www.google.com/search?q=nike+zoom+rotational
Shows a whole pile of results from 'google shopping' for me.
Are those really the top results?
Here's what's going on there: Google figures, from your query, that your intent is probably shopping. And those are the top 4 results from the shopping corpus. If you click on the "Shopping results for..." link, you can see the full shopping corpus.
I don't really know how the product corpus works, but AFAIK Google is not being paid anything for those results. They're compiled from a bunch of commercial sites across the web. Google gets paid when you click on the ads, which are clearly marked at the top and right hand column.