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I wonder whether this is simply because if you are #1 for a search, adding a paid ad roughly doubles the number of high profile links that lead to your site.
The title is inaccurate - according to the article if you have the #1 position you increase your clicks by 50%. The 96% increase is for positions 5 and below.
I don't know why any research was done into this because, this is pretty obvious information.

Google generally places 3-4 ads (sometimes more depending on the search term) above organic results in the search engine. My experience in SEO and doing SEO has found that generally, the following statistics (approx) is true regarding the percentage of traffic to the site when ranked in the following positions:

1 - 56%

2 - 13.5%

3 - 9.8%

4 - 4%

5 - 4.8%

6 - 3.3%

7 - 0.4% (generally because of where this result is on people's screens)

8 - 3%

9 - 1.5%

10 - 2.6%

These figures are approximate and can change when looking at different and higher ranking terms. This is just a general overview of percentages of traffic from those queries to particular sites, from my experience.

As a result, the first 5 results take up ~88.1% of all traffic to that particular search term/query. FWIW when I'm doing SEO, I'm only interested in ranking in the first #3 results.

Hence, if you rank #1 in the search engine and there are ads above you, you aren't getting all of the traffic (which of course is why they are there so Google can make money). Hence adding Adwords ads to that particular query and search term, depending on your adwords quality score and if you can get it into the top #3 main ads then you are obviously going to increase your traffic to your website.

Why?

Well if you're #1 in organic results AND you have an adwords ad in the top 3-4 main spots then you have 2 positions in the top #5 results for the query which are receiving ~88.1% of the clicks by users - and having 2 spots in the most trafficed positions you're obviously going to see an increase in clicks!

The numbers you have above dont tell the full story though, you lose information by averaging things out. (Like saying every human has half a penis.)

Navigational searches skew the #1 spot's CTR way high.

I was referring to everything else beyond 'navigational' queries. As, I don't bother to competing for the 'navigational' term as there isn't any point because, when a user types in 'Amazon' they want to go to Amazon.co.uk/.com they don't want to go elsewhere.

My statistics above are also based on my experience and are approx as, I completely ignore navigational search numbers from them as highlighted by my reason above and I also have statistics for much higher search volumes where the percentage of traffic to positions are skewed and much more varied.

As someone who has worked in Paid and Organic search with large companies, it always frustrates me the way Google does this research.

They need to break it down by Navigational, Informational, and Transactional query types. My company's experiments have shown that for informational and transactional, there is some (although not 50%) incremental benefit to a Paid Ad on a search where you are ranked organically #1.

For a Navigational Search, every single experiment we performed resulted in Organic traffic exactly making up for the drop-off in Paid when Ads were turned off.

Finally, they never factor in opportunity cost. By bidding on keywords where you are already ranked #1 organically, you are using budget that you could have used where you aren't ranking organically at all.

It doesn't suprise me because I've been watching people do this for years.

SEO and PPC aren't all that different when you get down to it.

SEO might look like "free" traffic and it is if you have no competition, but it takes time and money to rank for a competitive topic. Writing good content costs money, and developing relationships with quality web sites that will make links takes time, which costs money. It takes real effort to make viral content that gets links. And yes, some people buy links or do things with automation and that costs money too.

To make that part of a viable business, of course, you need to connect that to some kind of conversion funnel that makes some revenue.

So the kind of biz that's made the investment to rank #1 for a topic generally finds it's a good investment to buy PPC ads too. There's a powerful psychological effect when people are searching for something and see your link all over the place... it makes you look established, professional, inevitable and all that.

I agree with your view that for solid SEO foundation a company at times needs to invest its resources. However there is still a difference. - Even post huge investment you are not sure that you will get a preferred ranking on SERP - Also it takes time to reach the top. In case of PPC that time is less than a few minutes

I believe the reason PPC+SEO shines is because the first 2 things the user gets (Ad + 1st result of his search) both point in the same direction and this increases his confidence

For myself - I discovered this when I turned ads off because I was now the first two results for a few keyword phrases. And my visitors dropped, and my sales dropped.

I did some testing - and my (potentially incorrect) conclusion was that with the ad people ended up going to my site without seeing my competitors (which are pretty much all free downloads). Without the ad, people ended up looking around abit more or something.

For me, keeping the ad made me about 10x what I was spending on it.

tl;dr: Google says that it will be to your advantage to buy ads from Google.
seo blog/site spam.

Actual source is http://googleresearch.blogspot.de/2012/03/impact-of-organic-... (which sadly requires Javascript to even display anything). The actual research paper is available at http://research.google.com/pubs/pub37731.html

Why yes. If it's a site that writes about SEO, it must therefore be spam.

I mean, that's why Google briefed us about the research. Why they let us interview them on it. You know, question them about it, and why we quote them.

The "actual source" is effectively a Google press release, which our SEO blog/spam site did link to. The story that gives context about why they did more research.

Far be it from me to impugn the credibility of researchers I don't know, but I have to think there's at least some confirmation bias at work when Google concludes that giving Google money for paid ads is a good thing.
"Most Of The Time, There Are No Organic Result On Page One"

Can someone explain this? I'm pretty sure it doesn't mean what I think it means.

I assume this statement means that the advertiser's site does not appear organically on the first page of search results. Thus, buying paid placement on the first page only produces one listing on the first page (the ad) rather than two or more (the ad and the organic search result).