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How about extracting facts from pages, to figure out things like the inventor of the telephone or when a movie release will happen. Google touted doing all this using its Google Squared technology in 2010.
Having the direct answer might prevent some searchers from clicking through to any of these. But with the answer already in some of the page descriptions, they probably weren’t clicking much already.
So why is there a difference in the CTR? If I had to speculate... Google has more (perhaps better too) advertisers that will be seen on the first page. I bet there isn't a lot due to the ad positions.
In this case, i am not certain that the questions are adequately answered
a recent study looked at the average CTR for first page organic results. The result they found was 52% for Google and 26% for Bing