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I've seen this before that they only show extensions to a URL in the first couple of listings. I think it has more to do with how Google wants to show the top results than with the authority they have. Although there probably will be some correlation between the two.

Glad I could help!

Hi NetReach, Matt-Antonio has raised 2 very important points, the first being that if you see competitors' listings with a category that no longer exists in the new Google Places for Business categories, this is likely because it's left over from the custom category days. The link he's included in his reply goes to Mike Blumenthal's category tool that should let you see which categories are currently available. I agree with you that 'electrician' isn't there. You'll have to find the next-best options.

Here are some resources for you.  Some old and some recent.  I personally only add links to a page that are helpful to anyone on that is on that particular page. How Many Links on a Page: Rand Fishkin talking about footer links for user experience. Dr. Pete talking about the number of links and how many is too many Jennifer Slegg of Search Engine Watch talking about how many links per page Footer Link Info: John Doherty, formerly with Distilled, wrote a good linking blog on Moz and it had good info on Footer links.  He also did an awesome White Board Friday on Internal Linking Moz Help with Internal Links: Here is Moz's own take on internal links.  http://moz.com/learn/seo/internal-link I hope some or all of this helps! Darin