Robert_Charlton - 7:49 pm on Apr 23, 2013 (gmt 0)
I have always found this to be true, but have always attributed it to overall credibility. Only "symbiotic" in the way that because of the high ranking of each they offer increased credibility which has the effect of increased CTR and conversions, but not that the high ranking on organics offers a biased playing field in Adwords...
Precisely my interpretation. It's the increased credibility which increases the click-throughs.
Also, there is a credibility that exists beyond the search page... and favorable mentions from outside the search page also have a symbiotic effect. They even affect what you search for, whom you will trust 'with your credit card information', what food you eat, what movies you see, what sites you link to, what links you click, and what you recommend to friends or business associates.