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Therefore the iPhone share of total search ad spend is about $3B. This link puts the overall market (inclusive of Android) at roughly $9B in 2014. That makes sense if you assume iOS to represent roughly 1/3 of devices.

http://www.emarketer.com/Article/Mobile-Account-More-than-Ha...

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Isn't the $9B for all mobile advertising, not just mobile search advertising? According to a Glodman Sachs report for 2014, back then they estimated that iOS advertising accounted for 75% of Google's revenue on mobile. That would make the Android search ad space worth about $1B.

Do you have a link to that report? I'd be curious to see if that's just the US or worldwide.

It's not available online. The story originally came from the NY Times, but I think Business Insider has the best info as they directly quoted a section from it.

http://www.businessinsider.com.au/apple-walked-away-from-iad...

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