Forum Moderators: martinibuster
It could have been a PSA in there. It could have been two one-penny AdWords bid (which could have been rounded off to a penny after Google's cut). That's why you shouldn't put too much weight on one particular slow channel.
Then again, if that is a particular site that continues to perform poorly -- while the rest of your pages are doing well with AdSense -- you can always experiment with something else there.