Fair enough, the previous quarter they just said this : "Search advertising revenue grew 47% driven by an increase in revenue per search and volume."

Google's CPC in their third quarter 2013 was down 4%. If the ratio holds then a 34% increase in revenue would translate into a 2.9% decrease in CPC. Of course that assumes they are trading traffic 1:1. Hence my curiosity. Google will announce in a couple of weeks and we'll get to see.