&gt;neither Amazon nor walmart advertises much...<p>What?  Amazon is googles largest advertiser and walmart outspends target almost 2:1 ...<p><a href="http:&#x2F;&#x2F;adage.com&#x2F;article&#x2F;digital&#x2F;amazon-tops-list-google-s-25-biggest-search-advertisers&#x2F;294922&#x2F;" rel="nofollow">http:&#x2F;&#x2F;adage.com&#x2F;article&#x2F;digital&#x2F;amazon-tops-list-google-s-2...</a>